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Construction is full of things that look wrong until you understand why they're right. A skyscraper moves in the wind. A bridge has gaps in it. Concrete is intentionally cut after it's poured. Old brick walls let moisture move through them. A crane lifts enormous loads while a giant stack of weight hangs off the other end. Roads buckle when it gets hot. And somewhere along the way, somebody decided manholes should be round. Most of us walk past these things every day without giving them much tho …