Models the physics of bouncing balls, or of particles in a gas or fluid, depending on the settings. If "Shake Box" is selected, then every now and then, the box will be rotated, changing which direction is down (in order to keep the settled balls in motion.) Written by Peter Birtles and Jamie Zawinski; 2002.
Modela la física de les boles en rebotar, o de partícules en un gas o fluid, depenent dels paràmetres. Si se selecciona "Sacseja la caixa", llavors de tant en tant, la caixa gira, canviant- ne la direcció (per tal de mantenir les boles en moviment). Escrit per Peter Birtles i Jamie Zawinski; 2002.