Prompt: A painting of a lonely traveler in a quiet night, longing for his hometown. The scene is set in a simple room, with a window facing the moon. The bright moonlight shines through the window, casting a white glow on the bed. The traveler wakes up from his sleep, and mistakes the moonlight for frost on the ground. He raises his head to look at the clear moon, and lowers his head to think of his faraway home. The painting expresses the traveler's sadness and nostalgia, as well as his admiration for the beauty of nature.