31 October was the “Welttag der Städte” (“World Day of Cities”). Fittingly, the architectural models of the Solar Decathlon Europe 21/22 of the Bergische Universität Wuppertal are exhibited at prominent locations in Wuppertal. They can be viewed there in the coming days and weeks. The two models of the KIT Karlsruhe SDE team RoofKIT can…