I've had AI create ascii-art (Nethack-style) dungeon diagrams when I asked it to write me a D&D adventure. Last time I tried it these dungeon diagrams were completely nonsensical, but that was a few years ago.
I think ASCII art in particular is generally a weak point for LLMs; maybe they could do better if they used an image model. Other ASCII syntaxes using matched { } delimiters seem like they would be easier.
