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VECTOGRAPHY

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[[2 pairs of 3D glasses taped into book, text on glasses read, "Press IN on nose. Edges bend and grip." and "for POLAROID* 3-DIMENSIONAL PICTURES
/ Press IN on nose. Edges bend and grip. / This is not the type of viewer designed for"]]

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[[blank page taped into book]]
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human visual acuity cannot resolve such closely spaced lines. However, under unusually high magnification, one can observe a lenticular pattern

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