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David Bushnell writes: “The handkerchief was crushed in order to put it into a pocket. The crushed and then unfolded textile handkerchief displays faint images of fold patterns that are characterized by alternating narrow straight ridges and broad flat areas. These faint regions indicate a buckling and postbuckling pattern in which, during crushing, strain energy was concentrated in very narrow regions of high bending normal to the straight ridges alternating with fairly broad inextensional uniform rigid-body rotation between the straight ridges.
This pattern is especially noticeable in the left-center portion of the photograph.
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