 In chapters 44–50 of the second volume of the Nature of Existence, McTaggart reassesses and rejects the theory that the C-series is generated by the relation of being less adequate than. He ultimately settles on the view that the C-series is an “inclusion series”, one in which each element in the series has as a proper part its predecessor in the C-series. The elements of the inclusion series are misperceptions of reality, but they are not ordered merely by the relation x is less accurate than y. Strictly, McTaggart distinguishes many C-series, one for which each perceiver, but argues that they are commensurable. The illusion of time is somehow generated by facts about the parthood relations obtaining between mistaken perceptions, but how exactly this illusion is generated is a question McTaggart admits to not having an answer.