Evacuated tube solar thermal system on the facade of Science World.
"When light from the sun hits the panel of tubes on the south side of our building, its heat energy is collected by metal fins inside. Liquid flowing in each tube transfers heat to our water system, so you can wash your hands in warm water. And just like with a Thermos, when the air between the tubes' two layers is removed. It creates a vacuum barrier that prevents heat from escaping and makes it possible to collect heat even on the rainiest day." - Telus World of Science
Build your own solar thermal collector (Via Instructables)
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