A fragment is an isolated part of something. It is an object with an incomplete characteristic, which suggests the former or future existence of a whole.
Not only does the fragment represent itself, but also tells us something about the entity it is supposed to be associated with. Whether talking about fragments of concrete or abstract things, the fragment can illustrate the logic, the form or the characteristics of the original whole.
– The savage mind, Chapter One : The science of the concrete, 1966