It is not sufficient, however, to define "abstract" ideas as those that can be instantiated and to define "abstraction" as the movement in the opposite direction to instantiation. Doing so would make the concepts "cat" and "telephone" abstract ideas since despite their varying appearances, a particular cat or a particular telephone is an instance of the concept "cat" or the concept "telephone". Although the concepts "cat" and "telephone" are "abstractions", they are not "abstract" in the sense of the objects in "graph 1" above.