So far, I have seen several films of his stop motion drawing films. The Menil Collection was showing two films when I was there a few months ago. The Fort Worth Modern had a huge show of his work with a great deal of his films. I must have spent hours being transfixed by this work. He would do a charcoal drawing, shoot it, then rub it out, draw over his old marks, and shoot again. Thus, he was making stop motion animation. He had strong political and social messages that both connected to historical context of the past 70 years. Link.