All of LeWitt's work embraces some kind of system. Here, he uses the frame of a cube to generate a series of geometric shapes. This sequence shows five shapes, but the possible permutations that could be drawn out of a cube are almost limitless. The prints are not made by LeWitt, but by assistants according to his instructions. By minimising his physical presence in the process of fabrication, LeWitt emphasises the importance of the concept behind the work. 'The idea becomes a machine that makes the art', he has said.