Umberto Eco (5 January 1932 – 19 February 2016)
Foucault's Pendulum is divided into ten segments represented by the ten Sefiroth. The novel is full of esoteric references to Kabbalah, alchemy and conspiracy theory — so many, that critic and novelist Anthony Burgess suggested that it needed an index.
The pendulum of the title refers to an actual pendulum designed by the French physicist Léon Foucault to demonstrate Earth's rotation, and has symbolic significance within the novel.
Some believe it refers to the philosopher Michel Foucault, noting Eco's friendship with the French philosopher, but the author “specifically rejects any intentional reference to Michel Foucault” — this is regarded as one of his subtle literary jokes.