As was announced in the (cuurrently) latest SketchUpdate entry, on the occasion of the exhibitions Frank Lloyd Wright: From Within Outward and Learning By Doing, the Guggenheim Museum and Google SketchUp invite amateur and professional designers from around the world to enter Design It: Shelter Competition. From now until August 23, you can submit a 3-D shelter for locations around the world using Google SketchUp and Google Earth.
Read more on the Competition page.
