| Moire patterns are the result of viewing two regularly-repeating
geometrical patterns that are placed atop each other. In this case, a perforated
screen is being rotated in front of another perforated screen in the gate
of a slide projector. The mechanical slide that accomplishes this is shown
below, being held by Jack Judson of San Antonio, Texas. This is part of
the extensive Judson Collection at the Magic Lantern Museum in San Antonio.
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