Still was one of the first Abstract Expressionists and much admired by the group as a whole. For instance, Still's above work presages Pollock's very similar composition (it's located at the top of the post). In fact, Pollock said that "Still makes the rest of us look academic." And he was a rather poetic artist, who had once said, "It's intolerable to be stopped by a frame's edge," which I think is a beautiful statement on the limitations of painting.
1944-N No. 2
1951-T No. 3