@unknownpoetx ok cupid (stupid) what does electro-magnetics have to do with the colour of the sky beyond water which is clear if pure.... It's an optic trick of our mind it appears blue .... just like the sun appears yellow, or skin is this colour or that colour, it's a pigment (colour to understand what we see) we give but as you like the word stupid, you are too stupid to see that and you are happy calling others stupid