ABSTRACT
I have accepted the assignment to speculate about the way dolphins perceive the external world. The issue is the kind raised by Immanuel Kant in his “Critique of Pure Reason” (Kant, 1787/1934), parts of which can be read as an essay on the human perceptual world. In addition to his metaphysics, which need not concern us, Kant presented a useful psychological theory of the structure of the experience of reality, which he described as a priori knowledge. The data for the theory happened to be his personal experience, but it may be possible to suggest something comparable about the dolphin's world.
