The Greenhouse, by Joost and others, is an opportunistic temporary insertion into a gap in Federation Square, Melbourne. (This piece was originally published at cityofsound.com on January 11th 2009.)
It’s built entirely from recycled and recyclable materials. The exterior is dis-assembled shipping containers and packing crates, filled with straw bale and covered with plants. When I was there, the walls were embedded with strawberry plants and potatoes were planted on top (and used in the potato salad served below), amongst other things.