 DATE: In the film, the book "The Nine Gates" displays an inverted  pentagram on its cover to represent its Satanic content. However,  the inverted pentagram only became associated with Satanism and evil  in the late 19th century due largely to a work by the French  occultist Eliphas Levi. As the books were said to be in their  original 17th century Venetian bindings, the appearance of the  inverted pentagram is an anachronism.