Watt Space are calling for entries for their 2012 Open Prize Exhibition. Current students are invited to respond to the impact human civilisation is having on the environment. For full details check Watt Space's website where you can download an entry form and get cracking. Entries are due Friday 27 April with the exhibition opening 17 May 2012. As for materials, it seems anything goes. Think recycled, new vs old, or mix it up with a bit of this and a bit of that.