The Moiré Pattern

In art,  a moiré pattern is a secondary and visually evident superimposed pattern created, for example, when two identical (usually transparent) patterns on a flat or curved surface (such as closely spaced straight lines drawn radiating from a point or taking the form of a grid) are overlaid while displaced or rotated a small amount from one another.

Moiré patterns are also used in physics and mathematics. The term originates from moire, a type of textile, traditionally made of silk with a rippled or ‘watered’ appearance.