  We’ve discussed Kant’s main complaint about the Nativist tradition, at least as a reply to the Empiricist challenge. But he also argues that we have no innate representations of Space, of Time, of Causality, or of any of the ordering principles we impose apriori (Zoeller 1989). To return to our earlier analogy: the initial state of the camera includes no pictures/representations of the innate abstract pixel structure that the camera imposes. But unlike the camera, we can acquire representations of these ordering constraints – these Kant terms ‘pure apriori ideas’ of Space, of Time, of Causality, of Substance, and so on. These pure apriori ideas play a crucial role in our understanding of how knowledge of mathematics and metaphysics and natural science is possible. In this respect Kant agrees with Locke that there are no innate principles or ideas to be ‘found’ in us. Both hold that all our ideas have their origin in experience. But Locke thinks that we build these ideas by abstracting from experience and recombining abstracted elements. Kant holds that such representations or ideas cannot be abstracted from experience; they must be the product of careful reflection on the nature of experience.[13]