This was done through a technique called “fore-edge painting,” which is an illustration that is hidden on the edge of the pages of the book. The technique allegedly dates back to the 1650s.
I love when books do this!! Or when a series has the entire picture only when you collect them all!
Fun fact: There is an ancient Greek goddess of friendship. Her name is Philotes.
Double fun fact: She’s a daughter of Nyx. Her siblings include Thanatos (god of death), Nemesis (goddess of retribution/revenge), Momus (god of mockery), Apate (goddess of deceit), and Oizys (goddess of depression and misery).
never forget that jkr looked at the real british mythology of brownies, dobbies, and other household fae, in which they will clean for you if you’re nice to them but don’t want to be paid because it wounds their pride (but you can leave out bread and milk cos that’s just like giving your bro a beer after he helped you move a couch) and said “i know how i’ll adapt them into my books! i’ll make them a slave race that’s horribly abused but doesn’t want to be free!”