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An interference pattern produced by overlaying similar but slightly offset templates. Møiré patterns can also be created be plotting series of curves on a computer screen. Here, the interference is provided by the discretization of the finite-sized pixels.
See also Circles-and-Squares Fractal
References
Cassin, C.  Visual Illusions in Motion with Møiré Screens: 60 Designs and 3 Plastic Screens.  New York: Dover, 1997.
 
Grafton, C. B.  Optical Designs in Motion with Møiré Overlays.  New York: Dover, 1976.