simply amazing. everything you see is an optical illusion.

[Copycon]

This is really awesome, the way this tests easily shows you how it works!

To complicate it even further; the centra in the brain that registers what you see and the centra where the signals are interpreted are not located at the same place in the brain. The "eyes sees things" before "you" do and the initial pictures can sometimes be based just on the asumption of how something looks like.