Crease

a seam vanishes when the pattern crosses it.

turn each panel until the pattern runs unbroken across every seam

The seams here aren’t a puzzle overlay 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, because it was always the same drawing underneath; there was never a second version being checked against it.

Concepts: pattern, continuity.

An interactive you play with one thumb, on Wundr.