Maxwell triangle Munsell scale chromatic circle chromatic spectrum chromaticity diagram color circle color cycle color index color mixture curve color solid color spectrum color system color triangle complementary color consecutive intervals degree demitint diapason diatessaron diatonic interval diatonic semitone enharmonic diesis enharmonic interval fifth fourth full color fundamental colors half step half tint hue cycle interval less semitone melodic interval metamer monochrome note octave parallel octaves primary primary color pure color second secondary secondary color semitone seventh sixth solar spectrum spectral color spectrum spectrum color step tertiary tertiary color third tone unison interval whole step