Light is beamed at a transparent CD. On the area below, a circular rainbow-colored play of light is created. By changing the position of the CD, it can be influenced how intensely the light phenomenon can be seen.
Various objects (geo-triangle, foil, etc.) are available to the visitor, which are placed on the light table. The polarization film is then rotated. Here light waves are polarized by two filters, i.e. each in the same direction of vibration. If the filters cross, what else remains hidden becomes visible.
This exhibit stands in the dark room to highlight the emerging effect. After the ring has been sunk into soap mixture, it is illuminated by a light source and projected enlarged to the canvas by a magnifying glass. The illuminated soap bubble works both as a mirror and as a filter and makes rainbow colors visible on the canvas.