“Doublings: I suggest that you hold in your hands two distinct books. The main text of each is the same. It is all too easy to compare these two books to the two Don Quixote invented by Borges, the one written by Cervantes, the other, identical in words, written much later by an imagined Pierre Menard. Despite the words being the same, so much has happened that the meaning is different.”

-Ian Hacking, from the foreword to Michel Foucault’s History of Madness