Triplicis uisus, directi, reflexi, & refracti, de quo optica disputat, argumenta

Ibn Alhazen

Analagous Scale Of Sounds And Colours

George Field

Sound Colour Circle for Itten

Josef Matthias Hauer

MacAdam Ellipses

David L. MacAdam

Three colour printing

Circle of Musical Keys, Temperaments and Colours

Josef Matthias Hauer

Konstruktive Komposition mit Dreiklang Gelb-Rot-Blau

Carl Buchheister