In the Ming Dynasty, the Palace of Heavenly Purity (Qianqing gong) served as the emperor’s bedchamber. Historical records describe a division of the bedchamber into nine rooms, each furnished with three beds. Every night, the emperor would choose a bed at random, and all curtains were put down, creating a veil of mystery as to where he rested. Even the emperor’s closest attendants relied on the sound of his voice to locate him when summoned.