A simple demonstration of how complex our eyesight is: put your hand between your eyes, touching your nose, and compare what you see with the left eye closed an

A simple demonstration of how complex our eyesight is: put your hand between your eyes, touching your nose, and compare what you see with the left eye closed and the right eye closed. On one side, knuckles, on the other, the palm. Yet when you open your eyes, your brain seamlessly fuses the images together and makes your hand largely disappear.