|  |  | Amazing Environmental 'Biowall' [animated pic] livebuilding.queensu.ca — The wall is made up of two layers of a porous material attached to a concrete wall. The material is approximately 3 centimetres (1 inch) thick, and is made of loosely-woven plastic that is screwed onto the wall in pieces. Plants are placed into gaps cut into the top layer of material; their roots hold them in place.More... (Environment) Comments Email Added 2007-10-16 21:10:10 suxmonkey