The ancient Greeks felt that the visual artist's goal was to copy visual experience. This approach appears in the realism of ancient Greek sculpture and pottery. We must sadly note that, due to the action of time and weather, no paintings from ancient Greek artists exist today. We can only surmise their quality based on tales such as that of Zeuxis and Parrhasios, the obvious skill in ancient Greek sculpture, and in drawings that survive on ancient Greek pottery. This definition of art as copying reality has a problem, though. Jackson Pollock, a leader in the New York School of the 1950's, intentionally did not copy existing objects in his art. While painting these works, Pollock and his fellow artists would consciously avoid making marks or passages that resembled recognizable objects. They succeeded at making artwork that did not copy anything, thus demonstrating that the ancient Greek view of art as mimesis ─ simple copying ─ does not sufficiently define art.