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The answer is pretty interesting. 

Our eyes see color because protons, (or light particles) are normally absorbed by things.Colors appear when certain wavelengths in the visible spectrum of light are bouncing from a certain material, and hits the eyes. This, in turn, triggers one of our cones (which are cells in the eyes) that determine what color it is. So, when we see a red apple, it's because all of the other colors in the visible light spectrum are absorbed by the apple, except red. 
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