 With regard to tabula rasa empiricism, Aristotle rejects the doctrine of innate ideas found in the work of Plato (427–347 BCE). He strongly denies, for instance, that we have innate knowledge of the principles of scientific demonstration (APo. 100a; Met. 993a). This aspect of Aristotle’s empiricism can be illustrated by his attitude to mathematics. For Plato, mathematical objects resemble the Forms—some may in fact be Forms (Shapiro 2000: 54–55)—which occupy a timeless realm distinct from that of the objects of sense perception (Rep. 510c1–511b2). They are known, therefore, either by recollection (anamnēsis) or by a kind of direct intellectual intuition. Along with his rejection of innate ideas, Aristotle also rejects this conception of mathematical objects. What the mathematician grasps are real features of perceptible objects, but regarded in a particular way (Lear 1982: 168, 184). They are regarded merely “as” (hēi) having quantity and being continuous or as objects of enumeration (Phys. 193b22–194a10; Met. 1061a28–1061b3, 1077b19–1078a4, 1078a22–28).