Check out the tiles (late 50s, early 60s) in the Tierpark’s Alfred Brehm Haus! Don’t they make you wish you were a bird or a wildcat? Being enclosed in a tiny space and stared at by humans all day is but a small price to pay for living in such visually pleasing surroundings, no?
GDR design
East German architectural bits and bobs
GDR design 
