One amazing article from the V&A's collection shows that people took this plan one step further. On one side of this fan is your usual fan decoration. But on the other side is a theatre layout with a list of subscribers. That way the owner of the fan could attend the theatre and do their usual people-watching with a cheat sheet of just who they were spying on- in case they forgot. What a handy tool for gossiping!
26 minutes ago