Scale of object vertices is in centimeters. The object faces were cut from large sheets of freshly pressed thick cardboard, and held together at the edges using standard wide masking tape (both on the inside and outside). Every possible precaution we could think of was taken to insure minimum deviations from planarity. The background wall in all images is also made from sheets of the same cardboard, also taped together at the edges. The floor is standard linoleum. 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