Rooftops : islands in the sky As urban living intensifies in density and numbers the city landscape expands both outwards and upwards. Architects and urban designers craft new and experimental structures while also investigating existing buildings for potential reinvention or expansion. In particular the roof of a building once a perfunctory structural element is now a city space in and of itself beloved for the capacity to eke out further room for living or to craft inspiring refuges away from the bustle of the metropolis.This international selection of urban rooftops catalogues a new urban dimension. Through over 50 bars restaurants temporary art installations and gardens it testifies to the variety of intelligent and exuberant designs that grace city summits from Sydney to Hong Kong Oslo to Chicago