Colour

In our colourful world, the commonest colour is green. Almost all plants have green leaves to help them make their food. Flowers may be any colour i can think of, and often then bright colours attract insects. Things i buy come in colours of all kinds, because the people who make them with dyes or paints to make them look nicer. Do i have a favourite colour?
Where do colours come from? The light that comes from the Sun is yellowish-white, but all the different colours i see are already in sunlight. This is because sunlight is really a mixture of all the colours of the rainbow. When sunlight splits up into its colours as it passes through raindrops, all the colours separate into a rainbow.

Here i see all the colours of the rainbow. There are seven colours from top to bottom. They are red, orange, yellow, green, blue, indigo, violet.
This explains why thing are coloured. I see a fire engine when sunlight is reflected from it into our eyes, but the paint covering the life engine takes in, or absorbs, all the colours in the sunlight except red. The red colour is reflected from the paint into my eyes, and i see the fire engine as red. White things reflect all the colours.

Not everyday can see colours properly. Some people cannot tell the difference between green and reds, or blues and yellows. Dogs and many other animals can't see any colours at all.