There's just the kind of happiness you get
and can't describe when you've had a great conversation with someone.

I don't want to reduce it all to the word "great",
for such a word shouldn't come with future expectations
or anyone's own interpretation of the word great.

Perhaps "it made me feel alive, and myself" would be a better description.
Finding out more about someone, and with your response both of you find out about yourselves at the same time. Very loosely put.

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Also, it'll be nice if people didn't judge birds by their flock.