There are philosophers who even now want to be ontologically serious. We need, they tell us, to see the world rightly and to do this we must work out a fundamental ontology which will display the most basic features that the world must have. This is not a matter of careful experimental investigation linked with adroit and imaginative theory design but a matter, or in some way essentially a matter, of pure rigourous thought. Pure disciplined philosophical reflection will yield the basic categories of the world.