In the folk tale Tsuru no ongaeshi (The Crane’s Return of a Favor), a young woman comes to live with an old couple and weaves cloth for them. She asks: “I will now weave cloth. While I weave, never look into the room.”
Worried about her, the old couple look into the room anyway. She is a crane. “I have been seen, so I can no longer stay here,” she says, and she flies away.