" There is no doubt, Daniel says. You really are you.
Yes, Hannah says. I really am me. And you really are you. But if we follow Einstein's thinking and add together you plus me plus time plus space. What does that all make?
Then she waits, like she always did, for Daniel finally to catch her up.
What? What does it all make? Daniel says.
It makes you and I more than just you or I, Hannah says. It makes us us. "

― Ali Smith , Summer (Seasonal, #4)