An instance of a class is maybe too like the class itself and each instance has the same behaviour other than by variation in its member variables. A sub-class in an OO hierarchy takes the behaviour of its parent and adds characteristics. These additional layers are maybe what our own selves add to what it really is. So this analogy is better:
Traversing the class hierarchy back to the root class
with many thanks to Myrthis Lathrop Jnr.
huatou: what is my root class?