Unsure, because I thought it was a fair question. I ended up replying. The short answer is that I'm not 100% sure what my original input was.

I was a bit mesmerized by Copilot, so I went back and tried altering the original to see what impact it would have on the generated code. Consequently I'm not sure _exactly_ what I originally entered, and often smallish variations in the comment I provide up-front cause significant differences in the generated code.

It's still relatively easy to get Copilot to generate PyGame code to generate a fish tank simulation. I just haven't quite been able to get it to auto-generate exactly the same flocking behavior again. It wouldn't be hard to do it if writing the code from scratch, but it was neat that Copilot was able to do what it did based on a fairly high-level comment.