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Wikipedia Text: Analysis of optical perspective
One further objection to the shroud turns on what might be called the "Mercator projection" argument. The shroud in two dimensions presents a three-dimensional image projected onto a planar two-dimensional surface, just as in a photograph or painting. A true burial shroud, however, would have rested nearly cylindrically across the three-dimensional facial surface, if not more irregularly. The result would be an unnatural lateral distortion, a strong widening to the sides, in contrast to the kind of normal photographic image a beholder would expect, let alone the strongly vertically elongated image on the shroud fabric.
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