The first colour wheel…
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English entomologist and engraver Moses Harris (1730-1788) devised the first full-colour wheel in 1766, creating the foundation of modern colour theory.
“The 18 colours of his wheel were derived from what he then called the three ‘primitive’ colours: red, yellow and blue. At the center of the wheel, Harris showed that black is formed by the superimposition of these colours.”
Thanks Moses. (source)