I find myself wanting to use the phrase "that is" or "that's to say" but often can't figure out what sort of punctuation I use with it. I think it's an explanatory phrase, but I'm not sure.
I mean, it happens all the time, that is, birds eating and ants crawling about, but I felt connected to those beings if not for just a moment.
Another alternative that doesn't feel right to me at all:
I mean, it happens all the time. That is, birds eating and ants crawling about, but I felt connected to those beings if not for just a moment.
Likewise, I think I might be able to justify an em dash, but I'm always nervous about using them for lack of proper understanding.
I mean, it happens all the time–that is, birds eating and ants crawling about–but I felt connected to those beings if not for just a moment.
Can someone provide a good example of how to use that phrase?