Ceiling-mounted tub faucet. A line of water pours down from a ceiling spout and splashes into the tub below. What a wonderful sound it must make when it hits the water. A band of light streams through the narrow vertical window and highlights this water feature.
Bathrooms are an ideal place for solitary skinny windows. They require a certain level of privacy, and expansive views are not really necessary. I'm not sure here if they window is for the owner, or the buddha?