“There is an external world, and it is full of things: tables, crocodiles, textures, etc. These things and this world exist whether I like it or not: their existence is independent of my beliefs, opinions, or preferences, and hence we say that such an existence — or, to use the technical term, such an ontology — is objective. There is also a subjective world, and it consists of internal states of mind. Such states are not ontologically objective, but subjective: they depend for their existence on the person who has them.”