As simple as the question .. it is hard to answer!
While some see only shades of blue fish, people can 20 000 shades of each other differ. Birds, in contrast see the additional perception of UV light the world more colorful than humans.
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| Jörg Siebauer pixelio.de / |
But basically it is not even shown. amazing in itself but the world is "only" black and white. Color is merely an invention of the human brain absorbs the light rays and converts them into signals. And depending on how much and how many suppositories you in the eye, has seen every species the world a little differently.
see Why then all colors? At night we see how our early days, but during the day, the world extends in all its colors. Had there not been enough for evolution to provide us with simple black and white vision equip?
How did the can, only be conjectured, but it is likely that the answer is to be found in our distant ancestors . Our ape ancestors made it possible to color vision, red fruit against the green background visible. Fruits have a higher nutritional value than leaves, so it was distinguished for its own survival advantage by using color space.
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