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
Water is not colorless, it is a very pale blue.
When light hits an object, it can either be absorbed or reflected, depending on its atomic structure.
Water, for instance, largely lets light pass through it, but it absorbs reds, oranges, yellows, greens and purples more than blues. That can be seen as a very pale blue, noticeable in deeper water
Grass is green because of chlorophyll, the chemical plants use to produce sugars using light. The chlorophyll absorbs all light except green, which it reflects
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