 The soul has two cognitive faculties: the sensitive and the intellectual. The sensitive faculty is bodily in the sense that its operations necessarily use bodily organs (QDA-1974-III: 102). This faculty involves a set of powers that are divided into external and internal senses (sight, hearing, taste, smell and touch, and common sense, estimation, memory and phantasia,  respectively),[8]  depending on whether their operations are performed through external or internal organs (i.e., the eye, the ear, the tongue, etc., and the three ventricles of the brain) (QDM; Ebbesen 2016: 36). The most complex animals must have both internal and external senses, because for their self-preservation they must have the capacity to form sense representations of external objects, whether they are present or absent (QDM; Ebbesen 2016: 35). All of these senses perform different cognitive operations that take different objects (e.g., sight takes color, hearing takes sound, estimation takes the harmful and the useful, memory takes sensorial representations, etc.) (QDM; Ebbesen 2016: 38). Moreover, each of these senses contributes in a specific way to the formation by the phantasia of a unified sensory representation (a phantasma) of an external object.