Philipp Otto Runge’s Farbenkugel (1810). The top two images show the surface of the sphere, while the bottom two show horizontal and vertical cross sections - from our story 'Highlights of Colour Theory: Illustrating The Mysteries of Light In Colour Wheels, Tables, Charts And Maps'

Page from Priced catalogue of artists’ materials : supplies for oil painting, water color painting, china painting … and drawing materials for architects and engineers, manual training schools and colleges (1914)

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