The goal
Restore the pictured mobile.
Match the silhouettes and green target arcs. The whole hanging sculpture responds when one physical weight moves.
One finger
Drag a weight onto another hook.
Dropping onto an occupied hook swaps both pieces immediately. The cobalt ghost shows the exact settled result before release.
→
Order changes access
Open the next hook.
A correct settle can slide a shutter open. Closed, arrow, or glass-blocked drops bounce home and spend no move. Undo restores the exact previous sculpture.