After Thomas Mann moved to Princeton in 1938, he resumed research on Joseph and His Brothers, and consequently checked out many books on Egypt from the university’s library. When his wife Katia discovered that to borrow a book he had to sign his name on a card kept in a pocket inside the back cover, she cried, “Tommy, you’re cheapening the value of your signature!” She instructed him to get someone else to check books out for him to avoid this catastrophe.

This reminds me that Marc Chagall used to pay for everything — including a tube of toothpaste — by check, because he guessed that at least some shopkeepers, knowing his fame, would keep the check uncashed as a souvenir or to be sold later.