Austrian artist and architect Friedensreich Hundertwasser, or Peace-Kingdom Hundred-Water, as his name translates, was anything but conventional. Known for bright colors, curved lines and organic forms--as well as performances in the nude--his work often generated controversy. A low-income housing block of his design in Vienna is no exception: the Hundertwasser Haus, planned in 1977, features undulating floors, a grass- and soil-covered roof and huge trees growing inside rooms, their branches reaching out from the windows. Hundertwasser refused payment for the complex, explaining that he wished merely to "prevent something ugly from going up in its place."