We know, the sun emits spectrum of seven colours. But the dominate colors are red and blue. The blue light is scattered more by air molecules than any other colours. Hence the sky looks blue. The ocean and water bodies reflect the sky's blue colour. Blue sky may fuel the imagination of the poets but according to science, it is an illusion.
During the sun set and sun rise, the sun's rays travel long distance through atmosphere to reach our eyes. Hence all the blue light is scattered away and only the red light reaches us. Hence the sun appears as red disc. Since the red can travel long distance without disturbance, it is used in danger signs and signals.
All the plant and tree leaves have green pigment called chlorophyll. It absorbs red, blue and all other colours of sunlight and use the light energy for photosynthesis. But the green is given out. Hence all the leaves look green.
Since red, green and blue are fundamental colours,
red+ green yields yellow.
red+ blue yields magenta.
blue + green yields cyan
red + green + blue yields white.
This additive colour model is used in computer monitor, TV sets and theater. Hence these three colours may be enough to paint a life like pictures by an artist.
We can see yellowish green {leaves} and yellowish red {setting sun}. But we cannot see 'reddish green' or 'yellowish blue'. That is the limitation of the eyes and they are called impossible colours. But still eyes can see one million colours.
note: we have red and blue lasers only till now.
post script: Emotionally blue indicates worries; red represents anger; green, the fresh produces. Colourful life is the beautiful life.
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