Visitors to the 2008 World's Exposition in Zaragoza, Spain, won't need raincoats or umbrellas to stay dry as they enter the 400-sq-meter entrance pavilion, even though, if all goes as planned, its walls will be made of water. Thanks to digital controls, the walls will part, creating doorways; reconfigure to change room size; or even disappear, on command. And the roof, itself a shallow pond, will also move up and down. The building, when realized, will be a first.
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