Consider things this way:
You look out to the stars on a clear night.
Through a 2 millimeter set of holes in your head, through the
optic nerves, the ENTIRE VISIBLE UNIVERSE FITS inside of your
brain.
You take the Universe with you wherever you go.
It belongs to you. It's yours. No one else's.
If you reach a shared understanding with someone else and
agreement, then you BOTH inhabit the same Universe - and yet,
always distinct because you can't fully see and comprehend
through their mind, nor they through yours.
I find it simply amazing that we are able to communicate and
comprehend each other at all, honestly.