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Optical illusion: Reddit’s newest visual challenge has a hidden spider, and it’s driving people crazy

Optical illusions are going viral these days. One particular challenge has left people squinting at their screens, trying to figure out what this chaotic, speckled carpet is hiding. An image going ...
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Eye magic : fantastic optical illusions : an interactive pop-up book / [written by Sarah Hewetson ; illustrated by Phil Jacobs ; paper engineering by Ruth Mawdsley]

"Artists & writers guild books"--P. 4 of cover. "Golden books"--P. 4 of cover. Contains acetate sheets, cards, 3D glasses and other aids in pocket. EYE MAGIC : FANTASTIC OPTICAL ILLUSIONS : AN ...