A book by Bill Watterson and John Kascht.
Really grateful to Revenant Manor for recommending this one to me. I was completely unaware it existed. As a fan of Watterson for decades, I can't explain the joy knowing he was making art again. Anyone who was a fan of his comic Calvin & Hobbes probably knows what I'm talking about. Waking up and reading that daily strip was pretty much magic every day. He created this small world that was as real as anything else on this planet. And his artwork and humor were second to none.
I highly recommend this "fable for grown-ups."
In addition to recommending this book, Revenant Manor also sent the below link. It's pure gold for people obsessed with the reclusiveness of Watterson, as it's an interview with both artists about their creative process.
Huge thanks, RM!