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’