I did some experiments of my own after this paper, but letting GPT-4 run wild, picking its own scene. It wanted to draw a boat on a lake, and I also asked it to throw in some JS animations, so it made the sun set:
https://int19h.org/chatgpt/lakeside/index.html
One interesting thing that I found out while doing this is that if you ask GPT-4 to produce SVG suitable for use in HTML, it will often just generate base64-encoded data: URIs directly. Which do contain valid SVG inside as requested.
