How do the AT and LCF engravings differ?
Corso notices that, although each of the three books contain nine engravings, three of the engravings in each book differ from those in the other two books. In addition, the engravings that are different are signed LCF, while the others are signed AT. Corso concludes that AT refers to Aristide Torchia (Aristidem Torchiam) and that LCF refers to Lucifer. The differences are: Engraving 1: The castle has four turrets (AT); the castle has three turrets (LCF). Engraving 2: The man holds the keys with his right hand (AT); he holds keys with his left hand (LCF). Engraving 3: The cherub’s quiver is empty (AT; not shown); the cherub has an arrow in his quiver (LCF). Engraving 4: The maze exit is bricked up (AT); the exit is open (LCF). Engraving 5: The sand is at the top of the hourglass (AT); the sand has sifted to the bottom of the hourglass (LCF, not shown). Engraving 6: The rope is around the left ankle (AT); the rope is around the right ankle (LCF). Engraving 7: The chessboard is black (AT
