An appearance is an occurrence that announces or indicates something else or refers to it, with the latter not showing itself as it is in itself. In Being and Time and in related works, Heidegger distinguishes between appearance on the one hand, and the phenomenon as well as seeming on the other. A phenomenon – by definition – does show itself as it is in itself, while a “seeming” pretends to do so. Later on, Heidegger drops this differentiation and identifies appearance mainly with manifestation or – more literally – preview (Vorschein) which is a mode of seeming and expresses being (GA40:107/105). Apart from that, “appearance” is repeatedly used as a technical term of Kantian philosophy and also without an explicit philosophical meaning altogether throughout all periods of Heidegger’s writing.