The father of abstraction, Wassily Kandinsky, was a synesthete. “Our hearing of colours is so precise … Colour is a means of exerting a direct influence upon the soul. Colour is the keyboard. The eye is the hammer. The soul is the piano with its many strings. The artist is the hand that purposely sets the soul vibrating by means of this or that key. Thus it is clear that the harmony of colours can only be based upon the principle of purposefully touching the human soul.” – Wassily Kandinsky