The tubes are wound into spherical shapes. Fluorescent green-coloured water, whose continuous flow is rhythmically interrupted by air bubbles, flows through the spheres, sometimes slowly, sometimes quickly, so that foam forms in some of them. The different colours result solely from the different flow speeds. Some of the spheres begin to bob slightly as the movements of water and air slightly change their centre of gravity. The video shows microscopic images of movements of liquids and other matter such as sand as processes of physical change.