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Have you given much thought to the concept of a door? Stepping into an office revolving door? Have you wondered who came up with the idea? And, what about hinges—why three instead of two? Clearly, a door can be a welcoming sign of hospitality or a barrier of entry. It could be an animal hide stretched across an opening or a rock rolled into place as Fred Flintstone might have used. Its style has evolved over many centuries and in many cultures. The materials used are as varied as the historical era they represent. This course will expand your appreciation of a patio door you slide or the remote control that opens your garage door. Doors are everywhere.