His series of eighteen small, mystical paintings entitled "Fensterbilder" ("Window Pictures," 1942) were painted while looking out the window of his house and observing neighbors engaged in their domestic tasks.
Hans serie med arton små, mystiska målningar med titeln "Fensterbilder" (1942) målades medan han tittade ut genom fönstret i sitt hus och observerade grannarna i deras vardagliga uppgifter.