Many of LeWitt's works explore the variations possible within the basic structure of a cube. In this work, each of the five structures occupies the same ground plan. They rise in single steps to a height of five units; the fifth structure is uniformly five units tall. The permutations are simple, clear and logical, and the viewer is invited to follow the mental process and imagine other variations or orders. The apparently straightforward structure of a cube can thus engage the viewer in very close attention and provoke imaginative responses.