Who or what is this poem referring to?
Within me you will find
One of like heart and mind.
As well as an entity
With inverted geography.
While I represent symmetry
Mirrors can show another identity.
But there will always be twins
Who generate many grins.
Hints:
The first 4 lines and last 4 lines should be interpreted differently. Also, avigrail's commentcomment about boobs is somewhat related to the answer.