"Albert H. Munsell was the greatest of American colorists, and his System is more widely used than any other in existence today. His conception of color harmony, of color organization and notation were original with him and mark one of the great contributions to the art and science of color order."
-from A Grammar of Color edited by Faber Birren
Hue, lightness and saturation: the three dimensions of color as discussed in the research paper, Method of Designating Colors by Judd and Kelly. Printed in the Journal of Research of the National Bureau of Standards, vol. 23, September 1939.