Ban Xia let out a sigh, put down the "Journey to the West" in her hand, stretched languidly, and looked up through the window. The Black Moon hung low in the sky, appearing about the same size as the white moon but much darker in color, nearly fading into the ink-blue canopy above. It seemed as if a circular hole had been cut into the velvet-like night sky, revealing the deeper universe behind it. The teacher said it was so dark because its surface was rough, not smooth, absorbing and scattering most of the sunlight, preventing reflection into people's eyes.