The greentainer project by Exposure architects demonstrates the innovative social potential of relatively simple green roof spaces. By importing a modern green house to function as a flexible space for art exhibitions, soirees etc the social use of a roof garden space can be enhanced without detracting from the vibrancy of its outdoor quality.

The Residences 900  in Chicago is a beatifully executed (but more conventional) social space on a green roof. However, the benefits of a mixed garden to ecology cannot be underestimated. The roof garden on the 17th floor of the Washington Mutual Bank  is a little more zen. It creates a contemplative social environment reminiscent of a wind swept plain – yet provides views across Elliot Bay.