 Sections 2–6 examine various influential interpretations of transcendental idealism, focusing on their consequences for (a)–(c). Section 7 is devoted more narrowly to the nature of things in themselves, topic (b), and the related Kantian notions: noumena, and the transcendental object. The primary focus will be the Critique of Pure Reason itself; while transcendental idealism, arguably, plays an equally crucial role in the other Critiques, discussing them would take us too far afield into Kant’s ethics, aesthetics, and  teleology.[2]  While transcendental idealism is a view both about space and time, and thus of objects of outer sense as well as inner sense (my own mental states), this entry will focus on Kant’s views about space and outer objects. Kant’s transcendental idealist theory of time is too intimately tied up with his theory of the self, and the argument of the transcendental deduction, to discuss here (see Falkenstein 1991; Van Cleve 1999: 52–61; and Dunlop 2009 for more on Kant’s theory of time).