Three-story-tall biowall in Queen's University's Faculty of Applied Science building Beamish-Munro Hall in Kingston Ontario, Canada. Constructed in 2003, the wall is composed of tropical plants to help clean and humidify the building's air. Photo by Renée Stephen, 2005.Look at this beautiful wall! It’s got really large plants in it. This image was taken over 1 year after constructions. The plants sure look happy.