" A true analysis of the incoming signal as to color must reveal the same information as Newton's prismatic analysis. A true analysis, that is to say, would resolve the incoming signal into its pure spectral components, each having its own independent strength. To report the result of such an analysis, we would need to specify a continuous infinity of numbers, one for the strength of each pure spectral component. Thus space of potential color information is not merely infinite, but infinite-dimensional. Instead, our eyes' projection of this information captures, as Maxwell discovered, just three numbers.

In short: the space of color information is infinite-dimensional, but we perceive, as color, only a three-dimensional surface, onto which those infinite dimensions project. "

― Frank Wilczek , A Beautiful Question: Finding Nature's Deep Design