Skyscrapers with curved glass look really cool, but they can hide a dangerous feature- solar convergence, also known as the solar death ray. Any kid who ever tried to start a fire with a magnifying glass understands that bending the sun's rays into one spot magnifies the heat. This famously happened with two skyscrapers, Vdara Hotel & Spa in Las Vegas, and the skyscraper at 20 Fenchurch Street in London. Both have concave glass that converge sunbeams into deadly spots that vary depending on the position of the sun. The confounding part of the story is that both buildings were designed by the same architect, Rafael Viñoly. You can label the first building as a screwup, but designing a second building with the same problem should be a criminal offense. Yet Viñoly defended his design, at one point even claiming that when the Fenchurch Street building was erected, no one knew London would have more sunny days in the future. This video is only eight minutes long; the rest is an ad. -via Digg
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Those are definitely dangerous for starting fires but the architects that design buildings made of mirrors or mirror-like materials cause tremendous damage to birds that don't realize they are flying into those walls and breaking their necks or wings or permanently injuring themselves.
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