How can we see colour?
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Our retina has a special type of cell called a cone. There are three types of cones according to the light wavelength they are most sensitive to: the blue, green, and red cones. Blue, red, and green are the primary additive colors, meaning the light waves that correspond to these colors add together to stimulate our cones and elicit the perception of creating new colors. Blue and green produce cyan, red and green produce yellow, and red and blue produce magenta. This goes on and on, as light waves of different wavelengths stimulate our cones to various intensities and amounts, producing a wide gamut of colors.
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