Refraction: ratios of sines

René Descartes

Colour Triangle

Philipp Otto Runge

Analagous Scale Of Sounds And Colours

George Field

Newton's Crucial Experiment

Jean-Antoine Nollet

Colour Perception - Light Rays versus Circumstances

Gaspard Monge

Colour Triangle

Philipp Otto Runge

Maxwell's Colour Top

James Clerk Maxwell

Three colour printing

Colour circles

Claude Boutet

Trois Couleurs Primitives

Claude Boutet

MacAdam Ellipses

David L. MacAdam

Triangular prism

René Descartes