Planting the Seeds of Political Activism Through Treehouses and Onions: The Legacy of Osman Kalin

I've ventured through a few treehouses in my time, but I've never seen one like this before. Upon first glance, this rustic curiosity, perched on a bed of graffiti and ingrown foliage looks like an abandoned shack. Perhaps inhabitants have frequented the place on occasion, needing temporary refuge from the streets. However, being in Berlin,…