Lovelock's classic DaisyWorld model, demonstrating homeostasis via ecosystem feedback loops (daisy albedo). DaisyWorld was invented to explain how the Gaia Hypothesis did not require a sentient Earth, but only feedback loops. The DaisyBall variant uses a 3d world, where each daisy location differs in solar input based on lattitude and axial tilt. DaisyBall and DaisyWorld are used in teaching high school and university level environmental science.