20 classic optical illusions that stump everyone

While new optical illusions go viral all the time, here are some of the most famous illusions that have kept us scratching our heads for years.
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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 ...
insider.si.edu

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 ...
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Inside Chicago’s $50M magic mansion: ‘The Hand & The Eye’ opens April 18

The Hand & The Eye opens this month in Chicago's McCormick Mansion, featuring global performers, dining and hidden rooms.