 Such forms, received intentionally in the external senses, are known as sensible species. Received in the internal senses, they are known as phantasms. Received in the intellect, they are known as intelligible species. Such forms—for instance, the sensible species of heat—are that in virtue of which we perceive, for instance, the heat of external bodies. That such forms do not make possessor actually hot (etc.) is perhaps just what it is for a form to exist intentionally. But there is scholarly disagreement over what it means to say that such forms are “spiritual” and “immaterial” (Hoffman 2014).