A tiny airplane flies across the small painting—or is it a photograph?—of blue sky in the middle of the frame. If you watch carefully for a brief period, you will see the contrails left behind by the airplane. But if you want a closer look and move your face nearer to the image, the contrails disappear. This is an interactive work in which participant and work affect each other. It is, however, the opposite of the usual interactive work: if the participant responds to the work, the work disappears.