A frog’s brain is set up to recognize food as moving objects that are oblong in shape. So if we take a frog’s normal food — flies — paralyze them with a little chloroform and put them in front of the frog, it will not notice them or try to eat them. It will starve in front of its food! But if we throw little rectangular pieces of cardboard at the frog it will eat them until it is stuffed! The frog only sees a little of the world we see, but it still thinks it perceives the whole world. Now, of course, we are not like frogs! Or are we?