Gas orbits a central mass under softened 1/r² gravity, and viscosity bleeds off its spin, so it spirals in. Every bit swallowed raises the luminosity L, and L pushes outward on the remaining gas as L/r². L fades with time.
Tap to drop a cloud of gas. The same ?seed= always gives the same run.
LITNewtonian gravity, plus a mass ledger: gas + swallowed + blown out = spawned, checked every 30 steps, or the page throws.
AMBERBlack-hole homeostasis is a toy of AGN feedback and the Eddington limit, in Dave’s homeostatic framing.
WALLNot general relativity: there is no horizon physics here.