Earlier on this year for the Fact Project, I decided to make an activity book based on the fan. I discovered a fan on the Pitt Rivers Museum website, with a mirror on the handle, perhaps used to look over one's shoulder at a ball in the 18-19th Centuries.
This reminded me of the fan language, which was also used during this time. It was a secret way of communicating at these events, where the young were strictly chaperoned and there were many rules of etiquette.