Building called "Green Citadel"; architect Friedensreich Hundertwasser in Magdeburg in Saxony-Anhalt, Germany.
"The straight line is a danger created by man because it is foreign to the nature of man, of life, of all creation ..." he says. (http://e-cours-arts-plastiques.com/friedensreich-hundertwasser-artiste-ecologiste-engage/)