> These are cultural artifacts, like deeply personal poetry, made purely for the process of it. Not practically useful, not state of the art, not research level, but... a personal journey?

I can't speak for the author but this is exactly how I look at the lisp I'm developing. It's a lifetime project. I had some kind of vision depicting how different things could be, and at some point I started trying to make it happen. I want to convince myself I'm not insane for thinking it was possible in the first place.

It's good to have a life-time project and watch it evolve over time. Nothing insane about that!