Agnes Martin and Ray Johnson has a long-term correspondence
both could be said (Kienle 196) to be deploying "systems outside the self to produce a tactit critique of the authentic and autonomous subject and to point forward to an alternative ethics of selfhood"
see Ina Blom's Name of the Game, which explores "how Johnson's deployment of postal networks relates to Martin's use of the grid" (275, in endnote)
for Blom, each technique is a system "that anchor[s] the subject space and make[s] subjective experience appear as objective reality" (Kienle's summation, 275, in endnote)