This is a model of disease transmission in a school. Certain squares in spaceland have been designated to be doorknobs where sick agents are able to leave a stamp indicative of them leaving the pathogen behind. When healthy agents encounter dirty door knobs, they are likely to pick up the disease. Teachers (large blue agents) can clean doorknobs and do not get ill. When the setup button is pressed, the clear terrain block removes all markings made on the surface of spaceland (which result from stamp, pen down, etc.). This allows the simulation to restart completely.
