Hand it a video. It cuts the picture to the exact geometry of your displays and sets it as your desktop. Not three copies side by side: one continuous image, and it moves.
Free, tip if you like. Signed and notarised by Apple · no account · no telemetry
They become one surface again — and something is happening on it.
Not a slideshow: the video plays behind your icons, decoded in hardware, one pass shared across every display.
One tile per display, computed from the frames and scale factors the system actually reports.
Mood, contrast, warmth: you adjust by looking at the picture, never by typing a number.
Each keeps its own. It comes alive when you arrive, and stops when you leave.
No colour seam when it kicks in, no manual setting to fiddle with.
One file holds everything, and applies as-is on another Mac — even without the original video.
You lock the screen, you go for lunch, you return. The scene didn't start over: it kept going without you. That's the detail no screenshot can show.