Trippy blotter art
A sheet of LSD blotter paper printed with this approprately psychedelic optical illusion is up for auction on eBay. Click the image for the full effect. Presumably, the paper has not been dipped. I've also seen "blotter art" printed with M.C. Escher illustrations. Link (Thanks, Michael-Anne!)
UPDAPTE: BB reader Carlos Poker points out that the optical masterpiece borrowed for this blotter was created by Akiyoshi Kitaoka.
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