Judd’s "progressions" develop according to mathematically based sequences. The Fibonacci sequence occurs in natural processes, such as the branching of trees or leaf arrangement in plants. Each number in the sequence is the sum of the preceding two: 0, 1, 1, 2, 3, 5, 8, 13, and so on. When translated into volume in this sculpture, the small yellow forms on the right increase rapidly in size. The interstices follow the same pattern, but in the opposite sense. Each element has a symbiotic relationship with other parts as well as with the whole. While a progression can develop to infinity, the material form and physical limitations of sculpture define, limit and complete it, engendering a sense of union and singularity.