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!
I am Silver Tongue, I am an artist. I have many characters and you can check out my art in the art tag. I occasionally practice witchcraft though I don't do anything too complicated. I am girl 2 and don't know what else to put here.