Stephen Makin offers an account of indifference arguments and the pre-Socratic atomism underpinned by this sort of reasoning. Used by Parmenides, Democritus, Plato, Aristotle and Leibniz, as well as some contemporary philosophers, indifference arguments start from claims about a balance of reasons or an absence of asymmetries. While some provide plausible support for strong conclusion, others produce no conviction.