Solar system's planets
The solar system's planets each exhibit tendencies of self-organization according to Lee F. Klinger:
Indeed, every planet in this solar system may be viewed as a complex system, self-organized and self-regulating in a state some distance from equilibrium [...] Self-organization is clearly evident in the rings of Saturn. Self-regulation is seen in the persistent red spot on Jupiter. Mars, Venus, and the moon all have surface features with symmetrical and fractal properties (Bruno et al., 1992). Hence, all planets might be considered complex systems.
- Lee F. Klinger, "Gaia and Complexity" in Scientists Debate Gaia ed. Stephen Schneider, James Miller, Eileen Crist, and Penelope Boston (Cambridge: MIT Press, 2004), 192, 198.