A jigsaw played on a live pool. Pieces circle on a gyre and drift toward one rim, and you have exactly one hand - holding a piece stops it drifting, which makes every board triage rather than a puzzle. A piece that reaches the edge is gone, and the mosaic finishes with a hole in it.
A mosaic has come apart on a pool, and the pool is going somewhere. Pieces circle on a slow gyre with a drift underneath it, and anything that reaches the rim is carried off for good.
Holding a piece stops it drifting and levels it out, so your hand is a rescue as much as a placement. Every board is therefore triage: the piece heading for the rim is competing with the piece you already know where to put.
Flinging sends a piece back toward the middle, buying time you can spend elsewhere. A careful player can simply carry everything, but flinging is what lets you save two pieces drifting out at once.
The gyre circulates pieces around the pool, which stops the board being a constant emergency. The drift underneath biases that circle toward one rim, and it is the drift that actually costs you pieces. It turns on a slow clock and is drawn as streaks with a compass on the panel.
Later boards add eddies that spin pieces where they sit, then a wandering drain that pulls toward itself. The pool stops being weather and starts having intentions.
Losing a piece ends nothing. The mosaic completes with a gap where it should have been, and the score is how much of the picture survived. A run only ends when a panel comes in under half.
Every mosaic is generated - palettes, motifs and laying styles combined fresh each time, each tile individually bevelled - so no two boards are the same picture and nothing is downloaded to make them.