Feedback Loops: Central to a full understanding of dissipative systems, and especially those in symbiotic relationships, is the concept of system feedback (Stear, 1987). Complex systems with feedback loops that allow for self-renewal are called autopoietic structures. One example of a simple, self-organizing system is a whirlpool. Another example is the red spot on the planet Jupiter. Other systems, such as the human body, can be extremely complex (Briggs and Peat, 1989).