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A bow window or compass window[1] is a curved bay window.[2] Bow windows are designed to create space by projecting beyond the exterior wall of a building, and to provide a wider view of the garden or street outside and typically combine four or more windows, which join to form an arch, differentiating them from the more common and often three-sided bay window. Casement windows are often used.
Wikipedia contributors, "Bow window," Wikipedia, The Free Encyclopedia,
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