Moire and ai:moire,0%

Moiré pattern

A pattern that emerges when two grids are superimposed over one another.

Examples:

Danbooru post #1436922: Scan artifacts, interference between halftone screen in the original image and scanner samples.
Danbooru post #2558106: Resizing artifacts, interference between halftone grid and pixel grid.
Danbooru post #2765030 (music staff), Danbooru post #4309196 (fabric pattern), Danbooru post #1184284 (block texture): lack of anti-aliasing.
Danbooru post #2033517 (click "view original"): intentional easter egg.

Edit