Duality is a recurring motif in The Alchemyst, in which a number of binary elements create a sense of interconnectedness. Duality can be used to highlight the interconnected nature of those elements, or instead to create tension through their opposition. Josh and Sophie especially represent this idea, with Scott mentioning in the author’s note that “in mythological terms, twins are very special. Just about every race and mythology has a twin story” (372). Josh and Sophie are also referred to metaphorically as “silver and gold” or “Sun and Moon.” As a result, the narrative alludes to the twins’ mystical and natural bond to set up intrigue, as their duality can lead to union or conflict.

Flamel and Perenelle can also be viewed as dual figures, as they each have a specialty that balances the other out. In broader terms, science and magic are framed as binary components of the world throughout the novel. In turn, their union is symbolized by the field of alchemy, which the author describes as “a peculiar combination of chemistry, botany, medicine, astronomy and astrology” (373). Flamel and Perenelle’s respective abilities work best when combined, which foreshadows Sophie and Josh’s dual roles as well.