My aim is to show that the heavenly machine is not a kind of divine, live being, but a kind of clockwork (and he who believes that a clock has soul attributes the maker's glory to the work), insofar as nearly all the manifold motions are caused by a most simple and material force, just as all motions of the clock are caused by a single weight.
Johannes Kepler letter to Herwart von Hohenburg, 1605

[1] With our metacircular evaluator, a recursive function always gives rise to a recursive process, even when the process should be iterative according to the distinction of section 1.2.1. See footnote 2 in section 4.1.1.
5  Computing with Register Machines