A circular "café wall" optical illusion table
It's even more obvious from overhead
This table is made of four concentric circles that are actual, true circles, even though our brain processes them as spirals. It was handmade by Mike Guetta from ExoticTiles in Montreal, Canada. This visual effect is based on the café wall optical illusion.
The café wall illusion
The illusion was first observed on an actual café wall in Bristol, England, and explained in a paper by Richard L. Gregory and Priscilla Heard in Perception magazine.
Buy a homemade table for your own illusionistic café: Café Wall Illusion Table, Etsy>>
- See a moving version of the illusion at Café Wall Illusion, Michael Bach>>
- An interactive version, at IllusionWorks>>
- From the Exploratorium>>
- Technical explanation of the illusion at Dr. Gregory's site>>
- Found via an entry at Boing Boing: Optical illusion spiral table>>