How it is that we see different colors? This graphic shows the whole range of electromagnetic waves, of which only very few are visible to the human eye We can't see UV- or infrared rays, for example. But we can see colors of the visible spectrum because the electromagnetic radiation in these areas has a wavelength capable of acting as a color stimulus for our eyes. Thus, to perceive color we need: light, an object either to reflect or to let the light through, the eye and the brain. Different color are perceived just as subjectively as sounds, tastes or smells.

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