Kunst Haus Wien. Museum Hundertwasser

This guide to the Kunst Haus Wien follows painter Friedensreich Hundertwasser and his belief that straight lines were unnatural, from a 1967 lecture where he argued for it to the building itself, once an ordinary Thonet furniture factory before he rebuilt it between 1989 and 1991. It traces his ideas about a tenant's right to repaint the wall within reach and his wish for trees growing through buildings like fellow residents. Feel for the sloping floor as you walk in.