"I have never really got used to being on this earth. Sometimes I think our presence here is due to a cosmic blunder, that we were meant for another planet altogether, with other arrangements, and other laws, and other, grimmer skies. I try to imagine it, our true place, off on the far side of the galaxy, whirling and whirling. And the ones who were meant for here, are they out there, baffled and homesick, like us? No, they would have become extinct long ago. How could they survive, these gentle earthlings, in a world that was made to contain us."

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If we seek for the simplest arrangement, which would enable it [the eye] to receive and discriminate the impressions of the different parts of the spectrum, we may suppose three distinct sensations only to be excited by the rays of the three principal pure colours, falling on any given point of the retina, the red, the green, and the violet; while the rays occupying the intermediate spaces are capable of producing mixed sensations, the yellow those which belong to the red and green, and the blue those which belong to the green and violet.

— Thomas Young