An Ames room is constructed so that when viewed from a peephole it appears to be an ordinary cubic-shaped room, with a back wall and two side walls perpendicular to each other and perpendicular to the horizontally level floor and ceiling. However, this is a trick of perspective and the true shape of the room is trapezoidal: the walls are slanted and the ceiling and floor are at an incline, and the right corner is much closer to the front-positioned observer than the left corner (or vice versa).
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