Outside is pure energy and colorless substance, all of the rest happens through the mechanism of our senses. Our eyes see just a small fraction of the light in the world. It is a trick to make a colored world, which does not exist outside of human beings — but does it float

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Left: Leon Battista Alberti; Right: Hermann Ebbinghaus

Pythagoras

Left: Aron Sigfrid Forsius; Right: Michel Eugène Chevreul

Left: D. L. MacAdam; Right: Tobias Mayer

Albert Henry Munsell

Albert Henry Munsell

Philipp Otto Runge