Color theory

ISAAC NEWTON 

7 parts color wheel

ALBERT MUNSELL

10 part color wheel 

JOHAN WOLFGANG VON GOETHE

2 inverted triangles

PAUL KLEE

Three half-moon shaped areas

JOHAN L. LAMBERT

Triangular based pyramid

OTTO RUNGE 

Sphere

WILHELM OSTWALD 

Pyramid

ALFRED HICKETIER

Cube