Very similar to metaphysics, metatheorics, in the Anathem universe, deals with the abstract in terms of physical properties of the universe, such as the Hylaean Theoric World. This general theorical principal is the base of all of the events in the books. Of course, this would mean that all of the events events portrayed in the books became part of theorics as a whole, and have, as a result, become part of the realm of the theorical!