Is it our brain? Or are the things actually coloured? If they’re actually coloured, why? What makes them coloured? Why is water colourless but grass is green?
In: Physics
Ugh, this is sadly a hot topic and the mystic warrior types like to throw around chaff.
Colors come from the frequencies of light in the visible spectrum. It can be a mix of frequencies, and each frequency can be at different intensities. White light is a mix of all visible frequencies. Blackness is simply the lack of low-intensity. When light hits stuff, certain frequencies get absorbed or reflected.
Humans detect color through 3 types of cones in the eyeball. Red, green, and blue. They don’t line up perfectly, red and green overlap a lot. To deal with that (and a whole lot of other junk), the brain does post-processing. Color correction and over-saturation.
>What makes them coloured? Why is water colourless but grass is green?
Water is mostly transparent. It doesn’t reflect, so the light goes straight through. Enough water and it’ll look blue, typically. Grass is green because it’s full of chlorophyll, which absorbs the yellow light from the sun (past the atmosphere). It evolved that way. But different stuff absorbs and reflects differently due to the shape of it’s atoms. There’s a lot of nuclear physics I don’t get, but it’s like the size of the gaps in the microwave mesh only letting some frequencies through.
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