 Reality and Existence. McTaggart distinguished between reality and existence, both of which he held to be simple and undefinable qualities. According to McTaggart, the concept of being is the same as the concept of reality, and so it is a tautology to say whatever is, is  real.[35] Reality is a monadic property, and does not come in degrees. Existence is not to be identified with the conjunctive property of being real and being spatiotemporal, for McTaggart held that no existent is  spatiotemporal.[36] Moreover, reality is not to be identified with existence, since it is conceptually possible that something might be real without existing.