Using the sun's heat to curl the thermobimetal to the right configuration, it can also reflect solar energy and heat into a solar chimney. When the temperature rises inside the chimney, the hot air escapes drawing in cool air from below. Not only does this movement of air ventilates the space below, it provides a small breeze that can enhance the cooling effect.
Chicago Kiosk Design Competition
A retail kiosk with a self-sufficient, passive cooling system
Holon Design Museum, Holon, Israel
A place of cool respite under a man-made tree in urban Tel Aviv