A demo to show binocular stereopsis even when the retinal image from one eye rivals that from the other eyepic.twitter.com/Zq843bIiiF
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This is a stereogram.
Oh wow, so it is. Apologies again: should have spotted that. I made a text stereogram once: http://www.hidden-3d.com/index.php?id=gallery&pk=262&comment_show=1&gallery=text … - just occurred to me now these might work so much better (ie be easier to write) in Japanese.
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