 When he sets up his theory of place—the crucial spatial notion in his theory of motion—Aristotle lists various theories and problems that his predecessors, including Zeno, have formulated on the subject. The argument again raises issues of the infinite, since the second step of the argument argues for an infinite regress of places. However, Aristotle presents it as an argument against the very idea of place, rather than plurality (thereby likely taking it out of context). It is hard to feel the force of the conclusion, for why should there not be an infinite series of places of places of places of …? Presumably the worry would be greater for someone who (like Aristotle) believed that there could not be an actual infinity of things, for the argument seems to show that there are. But as we have discussed above, today we need have no such qualms; there seems nothing problematic with an actual infinity of places.