Notes on: Barad, K (2014). Diffracting Diffraction: Cutting Together – Apart. Parallax, 20 (3): 168 – 87. DOI: 10.1080/13534645.2014.927623.

Dave Harris

[I think this is a very useful piece to focus more my emerging criticisms upon, so I have been really nitpicking and there is as much of me as there is of her.]

[Let's start with the title. If you can diffract diffraction, can you then go on and diffract the result of that diffraction, ad infintum. Is diffraction in principle infinite? If so how do you manage it in practice? If I think of it in terms of the old-fashioned notion of the slow accumulation of academic understanding from reading a variety of books and periodically considering the implications, it's clear there is both an arbitrary and the motivated way to diffract. Presumably, Barad diffracts only stuff she already agrees with, or that suits her project. As I said in my comments on Murris's diffraction, the diffracters never seem to choose texts that are opposed to each other, and so as a result the diffraction is actually rather fractional, focusing on agreements, amplifications and not bits where texts might cancel each other out]

'Diffraction owes as much to a thick legacy of feminist theorising about difference as it does to physics' (168) [still a bit vague — which came first? Which is the more important, should they ever disagree?]. There is a need to re-turn to the past, to intra act with it and diffract anew in order to produce new diffraction patterns, 'spacetimematterings' [all these terms support each other and I doubt if they have any separable meanings]. We will discover a 'multiplicity of processes'[a deleuzian one or a merely quantitative one?]. We can compare this with what earthworms do when they turn the soil over. It is okay to use organic metaphors because diffraction is general and destabilises [all?] binaries including organic/inorganic. We are also going to trouble the notion of dichotomy — 'cutting into two', 'a singular act of absolute differentiation, fracturing this from that, now from then' [but where do we find these absolute differentiations as opposed to the much more common normal working differentiations where similarities are still acknowledged just temporarily suspended — more below. Interacting with diffraction like this can be seen as diffracting diffraction. [Using complementary terminology] 'agential cuts… Do not produce absolute separations but rather together–apart (one move)' [quoting herself]

There are no absolute boundaries anywhere, not between the new and the not new, or the here and there. 'Matter itself is diffracted' [who diffracts it, and again is this continual and infinite, or are subsequent diffractions constrained by earlier ones, as in 'compossibility'?] There are 'materialising and sedimented [so both active and passive?] effects of iterative reconfigurings', traces of what might have happened in 'an open field'. 'Sedimenting does not entail closure. (Mountain ranges in their liveliness attest to this fact)' [so what is the difference between materialising and sedimenting? What is she banging on about with mountain ranges?]

Spacetimemattering is dynamic. Diffractions are untimely, because time itself is broken in different directions and 'each moment is an infinite multiplicity' (169). The now is therefore an 'infinitely rich condensed node in a changing field' [so what does stabilise? How actually does this fit with normal notions of time, the notions that innocent feminist activists might be interested in?]

Let's return to the past 'in order to see the infinity that lives through it' [we're going to see infinity — or just an aspect of it guided by feminist politics?]. This will be a thick [not infinite?] moment, but we can designate it by space-time coordinates, such as 'Santa Cruz, CA late 1980s'. This is a moment where and when 'questions of differences broke through the breakwater of Universal Sisterhood' and renewed 'the lifeblood of feminist theorising'. The background was 'enormous labours and persistence of women of colour'. This breakthrough moment is 'dispersed/diffracted' [so those terms are the same now? Or is this an invitation to disregard the difference between them?] throughout the paper. It is an example of 'a diffracting condensation, threading through of an infinity of moments–places–matterings, a superposition/entanglement, never closed, never finished' [in other words it's had widespread implications, but claiming that it goes on to infinity seems a bit ambitious]

At that space-time coordinate, in 1988, Trinh Minh-ha is presenting a paper to a cultural studies meeting, on difference, saying that sometimes it leads to apartheid, but there are other implications — it refers to '"differences as well as similarities within the concept of difference"' [Deleuze gets into the same sort of difficulty in trying to argue there are different sorts of differences]. Trinh is obviously attacking colonisation where others are separated from selves through an 'absolute boundary, a clear dividing line' [so this might occur with apartheid regimes, but how common is it to have such an absolute boundary?]. Trinh also argues that identity is taken as something '"essential, authentic"', hidden to consciousness, but requiring '"the elimination of all [sic] that is considered foreign or not true to the self"'. This inevitably leads to a relation of dominance. It [this absolute notion] clearly presupposes 'a clear dividing line' between categories like I and not I, he and she, depth and surface, vertical and horizontal identity' (170).

There is an 'impenetrable barrier between self and other in an attempt to establish and maintain… hegemony' [this might be what ideologists of domination and oppression aim at, but how successful are they in establishing such hegemony is surely the issue]. There is a geometrical optics here, where the other is located behind a mirror. Others become the Other [Lacanian?] and difference becomes apartheid. Binaries are therefore instrumental to the workings of power [but hang on, even apartheid in South Africa was not just based on notions of binary identity, but on other forms of division as well to which they were related but not reduced? Is this case to be taken as typical, where tight binary divisions line up to tight social divisions and hegemony is always achieved? Can such a nice collusion ever be resisted or denied by experience? Did white South Africans never encounter black South Africans who did turn out to be talented or deserving? Did none of them ever have doubts about apartheid?].

So '"divide and conquer has [been] his [the Univesal male coloniser?] formula of success"' [but are there no other political strategies? What about all those clever analyses of how hegemony actually works, in Thatcherism for example? Is there some logical or socially-grounded reason for the dominance of divide and conquer — is the tendency to make binary divisions necessarily, solely and chronically likely to lead to such a strategy?] There is however [somehow] another '"terrain of consciousness"' for Trinh [so where did that come from?]. This sees '"dualistic oppositions"' [less opposed than binary ones?] Binaries are occasionally useful for analysis but 'no longer satisfactory if not entirely untenable to the critical mind' [in other words to the few who are able to break through the sad ideology that imprisons the rest of us?]. So we must disrupt binaries and think of difference differently [here we go again], not opposing it to sameness and 'not in any absolute sense' and not leading to separateness. How might we do this?

[We're not going to get an answer directly, but we are provided with some more material to think about. Maybe we are being invited to diffract? Barad has provided us with this material herself, of course]

F Grimaldi develops the field of optics, noticing that the boundaries of shadows are not sharply defined and suggesting that the laws of ray propagation have to be amended. He 'observes distraction fringes — bands of light inside the edge of the shadow', with no sharp boundary separating light from dark. He makes a breakthrough by imagining that light is behaving as a fluid and coins the term 'diffraction'.

Back to Santa Cruz again and return to the work of a certain G Anzaldúa [I'm gonna call her GA]. She writes a foundational text in feminist studies, Borderlands. Barad quotes her talking about the need to change the old boundaries of the self and cross over, escape. This is just like Grimaldi breaking through barriers. GA even describes colonisation in terms of darkness and light, with a Christian inflection about primordial darkness being split, and darkness subsequently being identified with evil forces with '"the masculine order casting its dual shadow"'. Back to Grimaldi and his interest in passing sunlight through two adjacent pinholes as a of anticipation of two slit experiments. He notices that additional light actually also increases the obscurity of the body [by producing more interference effects of darkness?] This 'queers the binary light/darkness story' [without invoking quantum physics at all?]. Darkness is now good, 'an abundance' not an absence. We can now 'call for a rethinking of the notions of identity and difference'.

[Let's review what has gone on. Barad seems to be offering a diffractive reading of Grimaldi on the one hand and GA on the other. The whole thing seems to depend on a use of similar terms, optical metaphors of darkness and light. There are differences, but these are not particularly emphasised — for example only GA goes on to draw conclusions about identity, Christianity and colonisation. Barad packs in behind by suggesting that GA offers the more general ontology, like her completing Bohr. This might be an interesting three wave diffraction — I'm not physicist enough to know what sort of patterns result from three waves. It actually looks like a classic interpretation, where the general ontology identifies particular characteristics lurking within the specific examples: as with all essentialism, it is almost certainly a tautology. Barad's pattern seems to be illustrating simple agreement via shared metaphors, not much more than Lacan's homonymy, relating the two uses of the word 'darkness' Neither Grimaldi nor GA seem to have relied on quantum physics. Grimaldi got to his conclusions using classic scientific experiment: GA got to hers in some unknown way — intuition? Experience? Through writing a novel?].

On to another early commentator on diffraction, Young, identifying possible combinations of two sets of waves, and noticing that the length of the path between light and slit, and whether the waves arrive in phase or not can affect the results. 'In this way, one might say that Young gives us an understanding of diffraction as the effect of differences' (172) [so it's now an effect as well as a cause of differences? The two are interchangeable for Barad of course]

Back to Santa Cruz and Haraway this time. Haraway reads Trinh 'through the figure of diffraction' [so she did it first?] — Haraway points out that diffraction maps interference and does not produce replication or reflection. It '"maps where the effects of difference appear"'[and where they don't?] . Trinh is disrupting 'taxonomies that locate subjects according to natural kinds' [and is not the first to do so — but is this Haraway generalising and essentialising? We might note that this is a dangerous kind of naturalism, unlike the nice critical naturalism embraced by Barad. Haraway goes on to describe the inappropriate other in Trinh as indicating '"a diffracting rather than reflecting (ratio) nality"' [I just love those split words], since '"to be inappropriate/d  is not to fit in the taxon, to be dislocated from the available maps… Not to be originally fixed by difference"' [but does this necessarily mean locatable in a diffraction pattern, rather than other ways of not fitting?]

Back to Santa Cruz and a conversation with GA 'about quantum physics and mestiza consciousness' [a conversation between equals? An alternating monologue?]. Barad's theory class is studying Borderlands. They discuss the two slit diffraction experiment and what GA calls mita'y mita [which I gather means 'half and half' and which refers to the experiences of dislocated persons, neither male nor female, for example — apparently they attracted a 'horrified' response and were seen as a natural --but see below] Barad says that electrons are queer particles also mita 'y mita, doubled, 'a theoretical impossibility (at least from the point of view of classical Newtonian physics)' (172) [classical Newtonian physics still seems necessary as a kind of residual straw man — is it assumed that that is the conception of physics shared by advocates of patriarchy or apartheid? Any realists at all?]. Electrons are both waves and particles. This is originally labelled a '"wave – particle duality"' and appeared as a 'disturbing paradox'. GA is quoted as saying that half and halfs are not confused, but suffering from '"an absolute despot duality"'. For Newtonian physics [it is the same --but hardly despotic?] — particles were supposed to be separated from waves, but electrons behave like both, 'each individual electron is somehow going through both slits at once', if we had a which-slit detector, this can itself produce particle behaviour 'impossible they say, but this is the electron's lived experience' [electrons now have lived experience, just like ambiguously sexed people]. GA says queer people are like that, both male and female in one body [again long recognised, surely, not least by Freud]. Bohr explains the behaviour of electrons by reworking the classical world view. GA argues for mestiza consciousness to rework the subject–object duality [so they are both in the same line of work really]. [This reworking is possible because it is grounded in experience that resists these idiotic dualities, which raises the whole question of who believes in them in the first place]. Bohr is really saying that electrons can 'perform particle-ness in this under certain experimental circumstances, and wave-ness under others' [fully exploiting the ambiguity of the term 'perform', which means both releasing behaviour and choosing behaviour]

[Barad adds her interpretation to explain the similarity between Bohr and GA — both reveal 'a contingent iterative performativity… An understanding of difference not as an absolute boundary… But rather as the effects of enacted cuts in a radical reworking of cause/effect'( 173--4) [and there was silly old GA just thinking she was raising the consciousness of mestizas by giving a bit of encouragement. But, GA also] believes 'in an ordered, structured universe where all phenomena are interrelated and imbued with spirit' [is this the same as Barad then or a different Christian interpretation?]. GA also uses the term 'performance, and says that objects and events are '"enacted"… Both a physical thing and the power that infuses it"' (174).

Back to the two slit experiment and its deep mystery. Mystery is apparently still 'alive and well in physics', and there is even a tradition of it, as when spirits were a part of Newton's science and had to be banned in favour of 'spooky action–at–a–distance. Physics has always been spooked' [so why present it earlier as operating with oppressive binaries?] Similarly, GA notes that the half and half's were also sometimes seen as possessing supernatural powers [so not entirely stigmatised then?]

Newtonian physics is binary, quantum physics is queer. There is no 'line in the sand' between micro and macro [straw men argue that?] But rather 'an ongoing reconfiguring of spacetimemattering'. Similarly, queer people can claim to be a combination of opposite qualities for GA [alternating ones as with waves and particles? Some entirely new transcending identity?]. When opposite qualities combine they do not flatten out or erase each other but maintain a 'relation of difference within'[well that's one possibility. I thought waves did cancel eachother out in diffraction].

GA again describes homophobia as a fear of going home [weak pun?] and proposes instead queer political identity that remains fluid, living between worlds [being a nomad] this shows she 'understood the material multiplicity of self, the way it is diffracted across spaces, times, realities, imaginaries' [or is this Barad putting words in her mouth?]

Back to Bohr and the need to rethink matter as waves and particles. Barad generalises to a more general 'rethinking mattering – what it means to matter, what matter means' [classic exploitation of the ambiguity of the English term 'matter'. Especially in 'Mattering is a matter of what comes to matter' (175)]. This means that differences are material and so 'meaning is material' [alluding to différance? Derrida awaits us below. We might  have suspected that with all the stuff on spooks and spirits?]. Difference is not fixed but is the product of 'specific interactions that enact cuts that make separations — not absolute separations, but only contingent separations — within phenomena' [but do cuts persist once we have made them and therefore cease to be contingent, as in reification?]. Oppositions are inside, there is '"no real conflict"' between objective and subjective. Difference is really the result of a process of differencing, intra activity within phenomena that are entangled. This is 'just as much about electrons with one another as it is about onto–epistemological interactions involving humans' [well, I think we need more than an assertion here?] Similarly, insiders can step outside, at least temporarily, and occupy threshold places able to drift between other and same, affirming similarity and persisting indifference. This unsettles the usual definitions of otherness for GA [describes a rather common act of playfully alternating identities, as in role distance? Or living in double cultures like working class grammar school boys or socially mobile proles?]

For Barad this shows in/determinacy, and the notion of the unified self [who exactly holds this notion? Political economists? Surely it was blown up by Freud?]. The self as a multiplicity [and getting gee- whizzy] 'a superposition of beings, becomings' with no oppositions [idealist, voluntarist and utopian in my view — as soon as we enter relations with other people, the abstract possibilities vanish]. We can have a conception of two that does not imply separateness, and of one that does not exclude multiplicity, says Trinh [but Irigaray said it first?].

We are talking of entanglements not simple unities, the preservation of differences, 'differentiatings entail entanglings' [especially if you define them to do so] and this leads to the famous 'one move — cutting together–apart]. Differentiations [in human affairs again] can be made, but 'culture has never been monolithic' [just now it was dominated by nasty binaries and oppression].

Differences multiply as well, and include those inside apparently separate entities like insiders and outsiders. So difference is not universal but is itself a multiplicity, 'difference itself is diffracted. Diffraction as a matter of differences at every scale' (176). [While we are here] 'each moment of time, each positioning space is a multiplicity, a superposition/entanglement of (seemingly) disparate parts' [implies inevitable perspectivalism?] There is a thick web of specificities, 'unique material historialities'. In the words of Trinh, we live in many worlds but they are all in the same place, the place we are in here and now.

Quantum physics clears diffraction and moves to a deeper level, of course 'without ever leaving classical understandings behind; rather they are always threaded through.' We now think of cutting together–apart rather than breaking apart, to 'agential separability' rather than differences or combinations between light and dark.

Superpositions are 'not a simple multiplicity, not a simple overlaying or a mere contradiction'. They are not inherent but the effect of agential cuts, 'material enactments of differentiating/entangling' [still leaves the question of who the agent is — nature itself? God?]. Quantum theory has undone classical notions of identity with terms such as superposition and indeterminacy between being and becoming — for example Schrödinger's cat cannot be described in a determinate way as either alive or dead [Derrida this time, en route to play about ghosts and haunting].

GA agrees that people can experience mixed identities, including being half and half [is this more rigid than general indeterminacy?]. [The diffraction between GA and Derrida seems to turn on them both using the term 'neither']. This does not mean there are no facts or histories or 'no bleeding'. Instead indeterminacies constitute 'the very material of being and some of us live our [missing word] with pain, pleasure and also political courage'. GA supplies some coping strategies for mestiza in the form of a poem [this discussion is long overdue as a form of resistance to binary divisions, of course]. We are not talking about dispersion because the disparate is held together still. Separability of agents is enacted by agential cuts and cutting together–apart [so two sorts of agents — one makes the cut and produces the other kind of agent?]. Separability, even of agents is 'the agentially enacted material conditions of exteriority–within–phenomena' [again I'm not sure if this is just the logical point that says that any attempt to separate implies that things were connected in the first place].

The disparate 'itself holds together' but without dispersion or the [bad kind of] difference, without defacing the heterogeneity of the other', citing Derrida. Quantum entanglement calls into question 'the very nature of twoness, and ultimately of oneness as well'. The old terms are undone like duality and unity, even [numerical] multiplicity, and 'between' will need to be reconsidered. We need a different arithmetic and 'a different calculus of response – ability'.

GA tells us [again] that survival for mestizas involves living in the borderland. The same goes for 'trans/queer/intersex consciousness. Transmaterialities' [citing a note saying Derrida was interested in real material conditions as well as just wordplay when he describes deconstruction, and referencing one of her own earlier pieces on transmateriality]. [There is another rather baffling quote from Derrida's Spectres about justice not just repairing injustice but offering some excess from dislocation in being and in time — pass].

Indeterminacy is a dynamic allowing the return of the excluded, and anything determinate is materially haunted by what is excluded and unintelligible. We see this with the dispersion of the wave packet [!] We see that the self is also dispersed by 'being threaded through by that which is excluded' [sounds more like Freud on the return of the repressed]. Nothing is ever absolutely outside. Indeterminacy opens up to things to come permits surprises and interruptions — ghosts never die for Derrida. Agential cuts continue for Barad in 'an uncanny topology: no smooth surfaces, willies everywhere [sic]' [discussed apparently in her piece on quantum entanglement, which also cites Derrida and hauntology]. This is like a 'ghostly causality'(179).

A poem from GA, one verse of which is in Spanish, refers to the permeability of borders, probably, and resistance to white colonialism from Mexicans and Indians. A border culture has apparently developed, meaning the border is no longer a simple division but rather something 'vague and undetermined' [another example of a non-binary division?], in transition, home to the marginalised.

Back to the Derrida quote, this time extending to justice in relation to the other is also being out of joint or dislocated.

[This gets her to] quantum dis/continuity as a non-doing. The term itself is 'redundant and contradictory' referring to 'the smallest unit, a discontinuous bit… of discontinuity'. [A whole lot of witty contradictions ensue, most of them depending on our unconscious use of classical terms which can be shown to be inadequate. It reminds me of sessions in English Literature where the pot was kept boiling because there were always distinctions or implications. The whole point there was to suggest that only the right sort of chap can tolerate all these ambiguities. I think it is another example of academic exclusion, to go with the Spanish verse and the irritating constant references. God knows what ordinary feminists would make of this as examples:] 'each designation marking a disruption, bringing us up short, disrupting us, disrupting itself, stopping short before getting to the next one. A rupture of the discontinuous? A disrupted disruption? A stutter?' (180). We are also told that logical disjunctions or impasses derive from the Latin a poria, that quantum tunnelling does not imply porosity — 'no w/holes are needed' and this is 'a possible impossibility and impossible possibility'. The whole poetic stodge is claimed to be  'empirical evidence [Jesus!] for a hauntology'. [Does Derrida value or require empirical evidence? Aren't all these possibilities really rooted in language? The whole thing for him also turns on playfully Marxist terms like fetishism in religion and in commerce. Barad does not seem to be interested in diffracting Marx]

Another node joining Santa Cruz and other places involving experimental meta/physics [why not 'met/a/physics' — much more thought-provoking], two slit diffractions, and the which–slit detector experiment which itself seems to produce scatter rather than diffraction. Then a shift back to a GA poem about how mestizas alternate between cultures because they are in all cultures at the same time [this is diffraction by adjacency — stick two pieces together and invite the reader to see a connection. Readers will see quite different connections, probably, so does this mean there are different diffractions? For Barad, however, the poem {?}] 'is direct evidence of Bohrian complementarity' — 'the atoms perform wave or particle in their interaction with the apparatus. The apparatus is an inseparable part of the observed phenomenon'.

We can add an eraser to remove which-slit information, after a particle goes through one slit or another. However, 'remarkably', the diffraction pattern reappears. This is a re-turn rather than a simple return. It appears only after quantum entanglements have been traced [in what sense of trace?]. [Barad glosses this as] 'it is possible to determine after the particle has already gone through the slits whether or not it will have gone through one slit or the other (as a proper particle will do)  or both slit simultaneously (as waves will do)!' (181). This means 'it is possible to not merely change what it will have done after-the-fact but to change who/what it will have been, that is, its very ontology (wave or particle)!'

This might be 'empirical evidence that it is possible to change the past', but that might assume that the experimenters change the past had already been present. Instead, '"the point is that the past was never simply there to begin with"' [quoting her quantum entanglements piece]. Similarly the future is '"reworked and enfolded through the iterative practices of spacetimemattering' which includes gathering which-slit information. '"All are one phenomenon… Space and time are phenomenal… Interactively produced in the making of phenomena [they do not] exist as determinate givens, as universals, outside of phenomena"'. The past is never been present and never will be, and nor is the future production of presence [citing Derrida, this time in Margins of Philosophy who uses the idea of presence as a metaphysical assumption produced by language?] What we get is 'indeterminacy all the way down. Empirical evidence for a hauntology [again]'.

There are also implications for diffraction and its connection with 'difference/différance'. The experiment 'brings to the fore questions of temporality, materiality and justice' that have always been implied in discussions of diffraction. [And now an aside]. This paper is a diffraction experiment. It would be wrong to see it as an narrative produced by an I 'since this position is counter to diffracting. There is no I that exists outside the diffraction pattern, observing it, telling its story. In an important sense, this story in its ongoing (re)patterning is (re)(con)figuring me' [so what are the material and social factors that produce a sense in which there is an I, Karen Barad? Can we dispense with the subject altogether? What is the agent that is producing the story? Why should a quantum interpretation be preferred over a much more workable commonsense interpretation of the subject in political terms?]. Her I is 'always already multiply dispersed and diffracted' [this is just an interesting philosophical position like doubting the existence of tables  that is totally unworkable without some process to limit the possibilities].

Then some more diffraction by homology. Barad says that nothing is actually erased in the quantum eraser experiment, and GA says that myth recaptures history that has been erased. Barad says that memory is never erased but is found in 'sedimented enfoldings of iterative intra activity — is written into the fabric of the world'. The world is a materialisation of its memory [?] Trinh says that history could never be simply the accumulation of facts based on some notion of a fixed past present and future, and that we must reveal the relations between them. Barad says that past and future 'are iteratively reconfigured and enfolded' and phenomena are 'material entanglements' Trinh again says that '"every word involves our past, present and future"'. Barad says that time cannot be fixed. Somebody called Marsan, expounding Trinh, says that storytelling and retelling shows that there are '"endless connections… The possibility of unending meanings"' [why stop there? Oh she doesn't…]

[An unusually clear bit]. We need 'to take responsibility for that which we inherit' for entanglements of inheritance. And there are more philosophical responsibilities too — to the future, to the 'non-contemporaneity of the present' to risk openness to indeterminacy. Derrida says that responsibility lies at the heart of justice beyond those living at the moment, to ghosts including '"those who are not yet born"'. Barad adds that the past is never closed 'but there is no taking it back' [which seems quite an important point]. Traces of past configurations are enfolded into materialisations of the past present and future.

Responsibility is not an obligation but 'rather an incarnate relation that precedes the intentionality of consciousness' [so this is a very abstract notion, well away from any idea of personal ethical commitments. It is still not clear whether this responsibility is a part of nature. We must remember that there is also an ambiguity here, since responsibility also means response–ability]. It is integral to becoming. It is iterative, 'an enabling of responsiveness' [so response – ability] [This whole thing is another annoying philosophical game of words really]. It is a matter of 'the iterative reworking of im/possibility', a matter of 'topological reconfiguring of the space of response – ability' [so much a repetition of the same basic argument in more obscure terms that it's getting close to deliberate bullshit. The continual repetition with slightly different uses of key terms also means she is not too sure herself she has pinned them down -- and that only she is in charge of them, an admissionthat this is not an approach that can ever be shared. It's a private language]  Trinh agrees that the self is released and absorbed, woven with other stories and lives [she also likes split words, including a-new and a-gain]

To differentiate is to make connections and commitments as well as to separate. There are interwoven threads, where interweaving breaks linearity. This results in '"a story… told mainly to say that there is no story' [Trinh] (184), such a complex 'tissue of activities and events' that there can be 'no single explanation' [OK  if the ambition is to exhaustively describe everything, but whose ambition would that be?]

Barad quotes herself as starting in the middle [oh no, implicit Deleuze and Guattari?], and 'going forward to the past' by re-turning [revisiting the past really — going forward by deciding tomorrow to revisit the past]. There we will find '"rich soil from which ideas spring… uncountable gifts given"'. Trinh agrees that time leaves traces in layers: thus 'everything is time' [well everything has the traces of time would be simpler, much less poetic obviously].

Back to her conversation with GA in Santa Cruz, thinking of diffraction and entanglement. The 'memory of these explorations' is held in the landscape itself [ie prompted by looking at the landsape] . The whole multiplicity is condensed into a moment of here and now because 'each grain of sand, each bit of soil is diffracted/entangled across space-time'. When we revisit the past [re-turn if you must] we rediscover 'thick tangles of spacetimematterings' [but we can't investigate those tangles very far, except in our minds. We can't experience any concrete manifestations of them except by the usual processes of assumption. This will inevitably be a subjective reapprehension of the past, or a Bergson revisiting of pst realities if you want to deny subjectivity]

[And then it ended, thank God. The acknowledgements also mention conversations about GA. We would normally call this intertextuality? Note 4 gives an example of this marvellous time travel: the reader will eventually get to the example of quantum erasure, but, in a very real sense of course, that's discussion is 'already in "here" "now"' (185). Note 7 insists that entanglements are infinite but the specific details of them still matter — quite a research programme. Note 9 declares that our purpose is to give thick understandings of diffraction. Note 21 says that her work is situated 'in physics, feminist theory and feminist science studies' now, but her discussions in Santa Cruz were more preliminary although she had already half finished writing the 2007 book and it got a couple of journal rejections. Note 22 describes the conversation she had with GA as 'one of the most sacred conversations… The joy of it, the recognition of common passions in different languages… Generosity, kindness and focused presence. That's why she uses her first name because using a surname would be 'too formal, stiff and artificial, and I didn't want to show disrespect' (186). Note 27 says she is obviously not naive enought to think she is being simply 'faithful to Bohr' but  is diffracting his work 'therough my agential realist understanding' -- so she diffracted Bohr when she read him or afterwards? Note 41 says her 2007 book is 'a hybridity that is and has beenalways already political' -- pretty evasive and stops it being judged as either. Note 48 is where she says that Derrida takes deconstruction to be  relevant to real lives. This is because we know  of his 'background and political focus'. It is not just 'academic wordplay. Note 63 points out the difference [sic] between diffraction and 'some forms of critique' -- 'questions of temporality and ontology figure differently' (187). Foucault notes that critique varies but tends to be reduced to '"dispersion, dependency and pure heteronomy"'. Diffraction is indebted to the forms of Marx, Nietzsche and Foucualt [equally?]. Diffraction also wants to take account of '(material-discursive) conditions of possibility...historical-social-poltical (naturalcultural) contingency', but critique offers 'disclosure, exposure and demystification' and diffraction 'an iterative practice of  intra-actively reworking and being reworked by patterns of mattering'. It works 'constructively and deconstructively ( not destructively)' [seems to be a licence to do what the fark you want really]. Note 64 also plays a linguistic trick with time when this paper is cited as 'forthcoming' [in a bit where she is quoting herself]. This is not just careless editing though -- oh dear me no.: it is 'a gesture to include what is also coming from the future'. Note 83 uses a more conventional term to reference her own work, however -- ''forthcoming'.  Note 65 explains that she includes the authors' names in brackets after the extracts 'in order to make the diffractive reading more  evident while respecting the style of the journal' My word she is so clever!]

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