The visible spectrum of light starts at red and moves to violet. Wavelengths of

The visible spectrum of light starts at red and moves to violet. Wavelengths of

The visible spectrum of light starts at red and moves to violet. Wavelengths of E.M. radiation slightly longer than red are infra-red and shorter than violet are ultra-violet, neither of which is visible to humans. My question is then: why do we see the spectrum of visible color as a cycle moving seamlessly from red to violet and through violet into red again (think of a color wheel)? Why do we not see the visible spectrum the way it would seem to make the most sense, i.e., fading in from invisible infra-red and fading out to invisible ultra-violet? This has been bugging me for some time now, hopefully one of the panelists here can give me a satisfactory answer or point me in the right direction. Thanks, -Liam C.

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