The Plan is set in motion by Colonel Ardenti, who shows a supposed Templar manuscript to Diotallevi, Belbo, and Casaubon.  
The narrator of this work and his girlfriend invent the term "discovering archetypes" as a euphemism for having sex and refer to their child as "The Thing".  Another character, the co-founder of the School of Comparative Irrelevance, creates as an alter ego an amalgam of Conrad characters called Seven Seas Jim, and claims that you can differentiate lunatics from cretins, fools, and morons "by the fact that sooner or later [they] bring up the Templars".  The Plan is set in motion by Colonel Ardenti, who shows a supposed Templar manuscript to Diotallevi, Belbo, and Casaubon.  For 10 points, name this Umberto Eco novel which begins near the titular scientific device.
The narrator of this work and his girlfriend invent the term "discovering archetypes" as a euphemism for having sex and refer to their child as "The Thing".  
{Foucault’s Pendulum}