‘What is a table?’ aims to define what it is to be a particular thing. It is a particular that bears certain properties but is not identical with, nor reducible to, those properties. Some of those properties may change and the object will remain the same object, but with a different appearance. To avoid confusion, important distinctions need to be made. Something can change qualitatively even though it has remained numerically the same. Being one and the same, despite such changes in qualities, is what is meant by numerical sameness. It concludes that particularity is an irreducible feature of reality.