Chlorine, laps, and the lane that stays empty

Went in at closing just to hear the empty pool hum under the lights. Mopped the deck twice. Replaced a cracked lane line nobody asked me to. People keep asking why I still do the maintenance for a pool that's been half-empty for weeks. I don't have a good answer. But the water holds a body's shape for a moment after they climb out, and I think I like being the one who watches that.