What if causation cannot be defined? Is it not one of the most basic and fundamental things? In that case, perhaps other notions are defined in terms of it: causation itself might be primitive. ‘Primitivism: is causation the most basic thing?’ discusses ideas from analytic philosophy and the Lockean empiricist approach and then considers the concepts of perception and proprioception. Is causation something that we can know about directly or is knowledge of it something that is inferred from perceptions of other things? It is shown that the case for primitivism about causation would be strengthened considerably if we were able to show that we have direct experience of it.