Music is the ultimate teacher.
Colors produce a spiritual vibration, the impression they create is important only as a step towards this vibration.
Color is a means to exert a direct influence on the soul.
The sound of colors is so definite that it would be hard to find anyone who would express bright yellow with bass notes or dark lake with treble.
There is no must in art because art is free.
That is beautiful which is produced by the inner need, which springs from the soul.