Knowledge

A bit of knowledge on optical illusions. Or scroll down to see what you came for.

Can animals see optical illusions? Hosico cat shows it with optical illusion rug

How many pipes?

Source/credit: Griffin_Claw

This is a geometrical illusion where it is hard to tell how many pipes are in the images. Even though vision is three-dimensional, we sometimes perceive the wrong information. There are 2 pipes in this photo, but the shadow of the left pipe creates the illusion of the existence of a 3rd pipe.