Today’s optical illusion has a very nice story behind it. Well, don’t all visual optical illusions do?
Nevertheless, today’s Café Wall optical illusion was discovered by Richard L. Gregory and Priscilla Heard in 1979, after noticing that the front of a café aka St Michael’s Hill, Bristol, England had black and white ceramic tiles that were offset half a tile in alternative rows.
What to see?
Just look at the imagine and see how the lines seem to be curved, and the tiles even seem to be moving. It’s truly an impressive sight. You have the impression that the tiles are wedge-shaped, when there’s actually a perfectly straight line.
How it works
Well, we’re going to say that our brain is a truly impressive machinery, but, nevertheless, a flawed one. The Café Wall visual optical illusion, is the living proof of the fact that the way our retina processes images when combined with the way our cortical cells of the striate cortex interpret images, well, we’re missing on a lot of things. And it’s a known fact that humans don’t have the best eyesight.
If you want even more detailed information on how it works, you should know that the apparent tilting is only caused by the orientation-sensitive cells in our cortex. They interact with one another trying to interpret the diagonal bands that are produced on the retina as a single line, that’s tilted in the direction of the diagonal bands.
We’re going to stop here with the explanation, because, well, we should simply enjoy an amazing visual optical illusion.