Have you ever wondered "How the carp in a pond would view the world around them? I thought. What a strange world theirs must be!

Living their entire lives in the shallow pond, the carp would believe that their universe consisted of the murky water and the lilies. Spending most of their time foraging on the bottom of the pond, they would be only dimly aware that an alien world could exist above the surface.

Once I was caught in a rainstorm. I noticed that the pond's surface was bombarded by thousands of tiny raindrops. The pond's surface became turbulent, and the water lilies were being pushed in all directions by water waves. ...I wondered how it all appeared to the carp. To them the water lilies would appear to be moving around by themselves, without anything pushing on them. Since the water they live in would appear invisible, much like the air and space around us, they would be baffled that the water lilies could move around by themselves."

Michi Kaku, Hyperspace, pp. 3-4.