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.
Modellearret it natuerkundige gedrach fan stuitsjende ballen of fan gas - of floeistofdieltsjes, ôfhinklik fan de ynstellingen. As de opsje "Doaze skodzje" selektearre is, sil de doaze sa no en dan draaie, wêrtroch' t de nei ûnderen ta geande doaze hieltiten feroaret. (dit om de ballen yn beweging te hâlden)