The Prefects' bathroom is a large room, softly lit by a splendid candle-filled chandelier. Everything in the room is made of white marble, including the rectangular swimming pool sunk in the middle of the floor. About a hundred golden taps stand all around the edge of the pool, each with a different-coloured jewel set into its handle. There is a diving board at one end of the pool. Long white linen curtains hang at the windows, and there is a single, golden-framed painting on the wall of a blonde mermaid.
The taps around the side of the bath each release different sorts of bubble bath mixed with the water: one tap gushes pink and blue bubbles the size of footballs, and another pours ice-white foam so thick it looks as though it would support the weight of a person. Another tap sends heavily perfumed purple clouds across the surface of the water, whilst a fourth causes the jet of water to bounce off the surface of the bath water in large arcs. The bath is deep enough to swim in; Harry's feet barely touch the bottom after he fills it.