The following pictures make repeating patterns through the use of either mirroring or edge blending.
   Mirroring is a simple technique whereby an image is displayed normally, then flipped, then normally again, to make a contiguous pattern, similar to record scratching.
   Blending is more sophisticated and subtle: the edges of a picture are blended together to approximate a continuous image; one edge is faded out where the other is faded in.

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Mirrored Patterns

Blended Patterns