  Each of these clauses requires unpacking. The plausibility of Aristotle’s theory turns on their eventual explications. The first clause (i) is intended to distinguish the active capacities of animals from the merely passive capacities of lifeless material bodies, including the media through which sensible forms travel. (Just as we do not want to say that the tofu in the refrigerator perceives the garlic next to it, we do not want to say that air perceives the color blue when affected by the color of a car.) But it does not yet specify what is required for having the requisite active capacities. Also difficult is the notion of isomorphism appealed to in (iii). As stated, (iii) invites, and has received, scrutiny. Interpretations range from treating the form of isomorphism as direct and literal, so that, e.g., the eyes become speckled when viewing a robin’s egg, to attenuated, where the isomorphism is more akin to that enjoyed between a house and its blue-print. Here especially the plausibility of Aristotle’s hylomorphic analysis of perception hangs in the balance.