 When Brentano’s students took up his notion of intentionality to develop more systematic accounts, they often criticized it for its unclarity regarding the ontological status of the intentional object: if the intentional object is part of the act, it was argued, we are faced with a duplication of the object. Next to the real, physical object, which is perceived, remembered, thought of, etc., we have a mental, intentional object, towards which the act is actually directed. Thus, when I think about the city of Paris, I am actually thinking of a mental object that is part of my act of thinking, and not about the actual city. This view leads to obvious difficulties, the most disastrous of which is that two persons can never be directed towards one and the same object.