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A paper device, which, when thrown from a tall apartment building, can catch an updraft and begin to oscillate as it "falls", theoretically, it could fly for hours, especially in areas such as Chicago where heavy winds can produce city-wide updrafts.
When I moved to Toronto, I flew a Perfect Urban Toy from my new apartment to the Humber River.
by Umshaad Trivates January 10, 2004