 Allison might reply to this objection by pointing out that it implicitly assumes that the claim empirical objects are in space is coherent independently of specifying a perspective on those objects. In the terminology of Allison (2004) it is committed to “transcendental realism” (see the supplementary entry:  Allison on Transcendental Realism and Transcendental Idealism).  If this were Allison’s reply to the objection, then it would show that the coherence of transcendental idealism, on Allison’s reconstruction, rests on the premise that there is no coherent sense to questions about how objects are independent of any perspective on them. This is important, because it is not always clear that Allison’s reconstruction does depend on this premise, and it is not clear where Kant argues for such a conclusion.