©Sebastien Puiatti
Green, blue, purple and red: The bright colors of a Northern Lights, scientifically called "Aurora borealis", usually only appear in polar regions. Dan Acher now lets them shine in the middle of Halle, with the help of artificial clouds and laser beams, which he beams to the dark sky. Depending on the weather conditions, the northern lights will sometimes move faster, sometimes slower and sometimes shine paler, sometimes stronger.