A full corner used to swap its single still in place, so a fresh screenshot was indistinguishable from the one it replaced. Each corner now holds three stills nudged inward by 9% of the frame per depth, and the newest one moves to the top of the layer, leaving the edges of the ones below visible. Fill order is slot-major, so a new shot never lands where the previous shot at that corner was. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Tg15tLAuT6NrCE1ZxKVgDB