A series of illustrations for the German issue of the magazine New Scientist. The topic was the search for giant energy absorbing space structures, which can indicate the presence of alien civilizations. The idea of these structures was originally developed by the physicist Freeman Dyson in the 1960s. The first row shows two variations of his Dyson Spheres, a swarm of planet-sized solar collectors and a ringworld. The bottom row illustrates other possible structures, a giant monolith and a solar sail.