DaisyWorld is the classic model in 2D, demonstrating homeostasis via ecosystem feedback loops (daisy albedo). There is no spatial structure. The daisies indicate percent population at a single site.
Used in teaching "Intro to the Earth System" at UCLA, among other non-Yale courses.
Peter Schoch wrote a DaisyWorld Lab for teaching his community college Physics students (Thermodynamics, and Blackbody radiators). Thank you for sharing, Peter!