EcoJar: Fish Tank Simulator

A sealed glass jar. Sand, water, algae, a few daphnia. Then you leave it alone and find out whether it holds. EcoJar is an aquarium made of cellular automata. Every grain of sand falls, every bubble rises, every alga photosynthesizes, one cell at a time, across forty thousand cells. Nothing is decoration and nothing runs on a timer: if the oxygen falls, it fell because something in your jar breathed it. BUILT ON ORB.FARM EcoJar is a fork of orb.farm, Max Bittker's open-source sandbox. We kept the engine and the feel: the cells, the light, the day and the night. We rebuilt what happens inside: how fish live and die, how oxygen swings through the night, how a jar starts, and which species can live here. Every change is measured against the original in a headless simulator before it ships. Play the original at orb.farm; its source is at github.com/MaxBittker/orb.farm. THE OXYGEN BUDGET IS…