 The previous section introduced phenomenological descriptions of various kinds of experiences. These descriptions are presented by phenomenologists as “eidetic”, which means that they are supposed to identify the essential properties of the experiences at issue. Phenomenology, however, is not merely concerned with providing eidetic descriptions of mental experiences. That is why the “phenomenology of acts” (Aktphänomenologie) should be distinguished from (although it is not unrelated to) the “phenomenology of objects” (Gegenstandsphänomenologie, Geiger 1907: 355). Among other tasks, the latter discipline (also called “theory of objects” or “ontology”) is concerned with the identification of the essential properties exemplified by objects of all kinds (and not only by objects of the mental kind).