 Ockham’s answer to Aureoli’s insistence on the need for an esse apparens to explain certain strange and misleading phenomena was to relocate the source of the error. The error does not come from the impression of some non-existent object. On the contrary, the naturally produced intuitive cognition does not lie. Instead, as Wood paraphrases Ockham, “error arises when the observer infers a proposition which does not follow formally from his perceptions” (Wood 1982, 224). Ockham calls the intuition of those appearances that cause apparitions “imperfect intuitive cognition”. In such cases, the immediate judgment of the intellect is not “that the object represented exists”, but “that the object was impressed” (and, it would seem, that this impression exists). The intellect errs, then, when it assents to what the “imperfect” intuition does not warrant.