Why does the world need colours of light?

Answer 1

We don't need colors, but light happens to break down into the different colors. It's just one of the properties of light. Sound does the same thing only into different frequencies into colors.

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That's like asking "Why does the world need opinions ?"

Color is a concept that is formed in your brain, when it finds out which nerves

in the back of your eye have had light shined on them. Different nerves respond

to different wavelengths of light, so the different wavelengths eventually cause

the impression in the brain of different colors.

So the question of "why do we need different colors" is really the question of "why

do we need to be able to tell the difference between different wavelengths of light ?"

I'm not going to try to figure that one out right now, but only point out that

there must be a great need and a good reason for it. We know that, just

because it was obviously the early creatures withthis ability who were the

ones that reproduced, became fruitful, multiplied, and filled the earth, while the

humans without the ability to differentiate colors did not proliferate, and are

found very rarely in today's population. (We call them "color blind". Their main

survival advantage is the fact that they get automatic draft deferments.)