Slightly off-topic but I've often daydreamed about a kind of Lisp-driven 3D Movie Maker (https://en.wikipedia.org/wiki/3D_Movie_Maker) where you could build movies from a REPL/SLIME the same way you do ordinary Lisp code -- evaluate a form, see the scene play out. With additions like modern text-to-speech and ML models generating meshes/textures, it could be a very pliable medium for a lone filmmaker to put together a movie all on their own, or even adopt a GitOps-y approach where multiple people (e.g. a script supervisor, cinematographer, light rigger) can collaborate through pull requests and code reviews.
I've genuinely had the same general idea (minus the ML part), and I've started working on it once but abandoned it. I might get back on that some day.
Another thing I considered was that, instead of the lisp, you'd have a math-y language and compose everything together. This has the added benefit that it compiles easily to GPU code. So like a chroma key thing would be a function that chooses one buffer over the other based on pixel color. You the compose that with other functions to create a frame. An APL-like language could be amazing here.
