"In a machine the parts exist for each other but not by each other; they work together to accomplish the machine's purpose but their operation has nothing to do with building the machine. It is quite otherwise with organisms, whose parts not only work together but also produce the organism and all of its parts. Each part is at once cause and effect, a means and an end. In consequence, while a machine implies a machine maker, an organism is a self-organizing entity. Unlike machines, which reflect their maker's intentions, organisms are 'natural purposes'." - Kant (Harold 2001: 220)