Glad you asked! The moiré effect or pattern is a natural interference phenomena of light produced when networks of lines are superimposed. Interestingly, there exists evidence that the effect was observed in ancient times. This pattern is formed whenever a repetitive structure, such as a mesh, is overlaid with another such structure. For moiré effect to occur the two structures need not be identical. It is noticeable when a cathode ray tube screen is reproducing a striped shirt or a building with regular joins, and the pattern seen through two rows of mesh or a picket fence from a distance. For a visual example search for “cathode ray tv moire effect” in Google images.
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