 The second example is Robert Rauschenberg’s Erased de Kooning drawing (1953), which is just what it says it is: all we see is an empty paper (with hardly visible traces of the erased drawing on it). Again, it is difficult to look at this artwork without trying to discern what drawing might have been there before Rauschenberg erased it. And this involves trying to conjure up mental imagery of the original drawing. Again, these were two classic examples. But there are more. All of Ai Wei Wei’s works, for example, rely heavily on our mental imagery.