Labov investigated the borders of words and concepts and the working of categorization in everyday communication. In a study drawings of „containers“ with different formal characteristics where shown to participants. They had to assign them with either „cup“, „bowl“ or „vase“. The decision gradually changed when they where asked to imagine the object filled with flowers or mashed potatoes for example. The categorization seems to be context dependent and fuzzy. Prototype theory in general states that we imagine categories of things around a strong member or representative of the category. It often refers to Wittgenstein’s concept of „Familienähnlichkeit“ (family likeness).