The Perfume River is a river that crosses Hue, the old imperial city of Vietnam which was build according Feng Shui principles. This harmony can be only fully appreciated on the water.
But the tranquility and the charm are instable on “floating water” as seen on this photo. Bonds in the background suggest that this sleep moment can be unbalanced at any moment.
Peace is fragile, and it was the duty of the emperors to preserve it.