Crease

a seam vanishes when the pattern crosses it.

turn each panel until the pattern runs unbroken across every seam

The seams aren't a puzzle drawn on top -- they're what one continuous pattern looks like when its panels are turned the wrong way. Get every panel back to its true rotation and the pattern is unbroken again.

Concepts: pattern, continuity.

An interactive you play with one thumb, on Wundr.