With all of those neat rectangular boxes, you’d think Mondrian would be rational and mathematical and as far away from the Occult as you could get. But Mondrian was a Theosophist. He [borrowed] the teachings of Madame Blavatsky–all of those boxes and those colors were meant to represent theosophical relationships. Annie Besant, the Theosophist around the turn of the last century, published a book where she had come up with the idea, novel at the time, that you could represent some of these abstract energies that Theosophy referred to by means of abstract shapes and colors. There were a lot of people in the art community who were keeping up upon ideas from the occult and theosophy, they immediately read this and thought, Gosh you could, couldn’t you? And thus modern abstract art was born.
— Alan Moore, MAGIC IS AFOOT: A Conversation with ALAN MOORE about the Arts and the Occult