In ontology, ontic (from the Greek ὄν, genitive ὄντος: "of that which is") is physical, real, or factual existence. In more nuance, it means that which concerns particular, individuated beings rather than their modes of being; the present, actual thing in relation to the virtual, generalized dimension which makes that thing what it "is". An example includes the particular person and their actions, and the cultural background to which these actions bear relation and derive meaning from, the former being ontic (located in physicality), the latter ontological (located in virtuality). Ontic describes what is there, as opposed to the nature or properties of that being. To illustrate : Roger Bacon, observing that all languages are built upon a common grammar, stated that they share a foundation of ontically anchored linguistic structures. Martin Heidegger posited the concept of Sorge, or caring, as the fundamental concept of the intentional being, and presupposed an ontological significance that distinguishes ontological being from mere "thinghood" of an ontic being. He uses the German word Dasein for a being that is capable of ontology, that is, recursively comprehending properties of the very fact of its own Being. For Heidegger, ontical signifies concrete, specific realities, whereas "ontological" signifies deeper underlying structures of reality. Ontological objects or subjects have an ontical dimension, but they also include aspects of being like self-awareness, evolutionary vestiges, future potentialities, and networks of relationship. Nicolai Hartmann distinguishes among ontology, ontics, and metaphysics: (i) ontology concerns the categorical analysis of entities by means of the knowledge categories able to classify them, (ii) ontics refers to a pre-categorical and pre-objectual connection which is best expressed in the relation to transcendent acts, and (iii) metaphysics is that part of ontics or that part of ontology which concerns the residue of being that cannot be rationalized further according to categories.