Colour Wheels, Charts, and Tables Through History
From the fascinating article by The Public Domain Review: "Colour Wheels, Charts, and Tables Through History"
https://publicdomainreview.org/collections/colour-wheels-charts-and-tables-through-history/
Georg Christoph Lichtenberg’s representation of the three-sided color graph developed by the astronomer and mapmaker Tobias Mayer.
Johann Heinrich Lambert’s three-dimensional adaptation of Tobias Mayer’s triangle.