This Crazy Land Art Deflects Noise From Amsterdam's Airport | Innovation | Smithsonian - 1 views
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john roach on 25 Jun 15"The 80-acre green space is the Buitenschot Land Art Park. Its trenches and ridges hold bike paths and sports fields, but these recreational features are a bonus. Its main purpose is to deflect ground noise, the low-frequency drone that planes make when they take off and land."