Haibun is a very old art form. I won’t pretend to know all the details of it or its history, but I’m pretty sure it’s as old as haiku itself. @dbooster is the guy to ask about that.

Two teenage boys, you’re head must be spinning;-)

I’m glad to hear this made you wistful. You’re the second person to have used that word. It strikes me as quite the compliment. Thank you!