The Michaelerwiese in Neuwaldegg is a place where you don’t see the forest for the trees, but a lot of trees and a lot of forest. You are here in the Viennese area, but everything is far away. Here Ernst Kainmüller, a building physicist with an energetic character, acquired an allotment garden on the first Lockdown day in March 2020 to build a small house for his family of four. A very small one: 35 square meters of floor space and five meters high allows the allotment garden law.