Open taps. Limited water. A cat that will not sit still. The water on the board is the fee from the chart.
Click a valve. Red handle is shut, green is open. Water follows communicating vessels — connected tanks share one surface — then falls by Torricelli: q = A·√(2gh). Full tanks spray hard. Empty ones don't.
The column is a wall only at its middle. A centered hit rinses faster and turns the cat around. A glance does almost nothing. Bounce it between two showers to buy time.
There is no refill. Trash dirties the cat. Three stars at 90 / 80 / 70 cleanliness. If it walks off or the tanks run dry, that's the run.
Trades on Pons v2 pay 5%: 1% to Pons, 4% into the Cistern. Harvest splits 50 / 35 / 15 — rinse 2.0% of volume, drip 1.4%, upkeep 0.6%. Holder-sharing stays off. Ticker $CATWASH.