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If you want to lace your house with cool hidden passages, you can’t simply add hinges to a bookcase and shout, “To the Batmobile!” You have to account for shelf sag, and you have to build something sturdy enough to work hundreds of thousands of times. “My history in robotics helps,” says Steve Humble, founder of Creative Home Engineering—the only company dedicated to making hidden rooms and secret doors. — wired.com