Same seed, same planet. On the left, life grown from fixed rules. On the right, life an LLM invented after reading this exact world. Drag the seed and watch both adapt.
Both were computed ahead of time, many worlds simulated in parallel and saved to a replay (real gemma-3-27b output via OpenRouter). Rules give you reliable variety; the LLM reads the world and tailors life to it. Same trick we later use to grow a lending world.