Between the input (wavelength) and output (colour), what occurs? How do we receive 650nm, for example, and interpret it as red? What even is red? What is colour, really?
In: Physics
Inside your eyes are special cells called cones that detected light and can distinguish between colors. There are three types of cones and each is sensitive to a different wavelength of color. You can see a graph of the sensitivities [here](https://en.wikipedia.org/wiki/Cone_cell#/media/File:Cone-fundamentals-with-srgb-spectrum.svg).
Your brain determines what color something is based on what specific types of cone cells are being activated.
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