 By crossing the “internal” with the “external dimension” of ideas we can get new and interesting “creations”. Combining, e.g., the smallest content with the smallest extension of a non-empty idea results in a new type of idea, viz. in an “intuition in itself” or, as we may say for the sake of brevity, an intuition (Anschauung). An intuition is an idea which is simple, i.e., has no proper part, and at the same time singular, i.e., has only one single object (WL I, 325–330). If an idea is neither itself an intuition nor contains any intuition as a proper part, it is called ‘Begriff’ (‘concept’) by Bolzano; examples of concepts are the simple idea [something] and the complex idea [God] whereby, for Bolzano, [God] = [the real being that has no cause of its being real]. A mixed idea is a complex idea which contains at least one intuition as a proper part (WL I, 330 f.). The distinction between intuitions and concepts plays an important role in Bolzano’s epistemology (cf. section 4.2 where we will also present examples of intuitions).