There is an episode on "Friends" where Chandler goes to work as an intern at an ad agency. In the meeting room where he is working there are some very interesting and unusual pieces of artwork up on the walls, at least 2 or 3 paintings, and it looks as if all the paintings are by the same artist. So, I would like to know if anyone might know the name of the artist whose work is on the walls of the office of the ad agency where Chandler was an intern in that episode?