I propose an experiment which demonstrates computation on the (DMT-altered) human visual system. It is a simple visual stimulus/web application which when viewed while on DMT should solve a graph cut problem, using colour as input and hallucinated depth perception as output (see blog post for full explanation):
I hope. I haven't tested it yet. Prior art includes Scott Aaronson's experiment in using soap bubbles for computation[1], and Mark Chiangizi's efforts to build logic gates from Necker cubes[2]:
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