Sandro del Prete
This artist encountered enormous difficulties creating a realistic sense of depth in his paintings in spite of his best efforts. One day, he decided to add a frame to the canvas, and painted it so that it appeared to be placed in the foreground, in front of the canvas. He pulled at the right angle of the frame and placed it in front of the canvas in such a way that he could no longer remove himself without the risk of creating a hole in the composition. A victim of his own imagination, he remains confined between the frame and the canvas, where he can still be seen today.