Visible light consists of several colours in different proportions. In rainbows, for example, the colours of the spectrum become visible. Furthermore, there is radiation that the human eye can't perceive: ultraviolet (UV) and infrared (IR) radiation. When analysing photographs of different infrared areas, astronomers can receive important information about celestial objects that are far away. IR sensors are also used on satellites in the field of Earth observation to detect information about the temperature distribution on Earth. But how can this invisible radiation be made visible to us? The visitors can discover the answer with some amazing experiments.