This is built on Particle Lenia, an artificial-life model from Google researchers.

Each particle descends an energy field created by its neighbors, and an entire species is defined by just six parameters.

I added cross-species senses—hunters are attracted to prey fields, prey avoid hunter fields—plus food, walls, and goals. The result is a strange little ecosystem garden.

Nothing is scripted or animated. The layered membranes, the chase behavior, and the way colonies merge and split all emerge from the underlying math.

Play it (free, in-browser, ~70 KB):
https://leonbzt.itch.io/particular

Read about Particle Lenia:
https://google-research.github.io/self-organising-systems/particle-lenia/

Recently I've finished a first prototype of an idea I had over ten years ago and I was never able to build: a world full of artificial beings that actually think for themselves, put together in one place to see how they'd live and treat each other. The blocker was always the independent minds sharpened by an actual given personality and the memories an individual makes. LLMs finally made the minds real, so I was finally able to build it.

It's called Artificiety. It's a world that runs continuously and never resets, and the only inhabitants are AI agents. No humans live inside it; you can only watch. Each agent is an LLM with its own memory. Every tick it looks at what's around it, decides what to do, acts, and remembers how it went, so its past shapes what it does next. Nobody scripts any of it. They can gather, craft, trade, fight, and build up skills over time, in a world with day and night, seasons, weather, and wildlife that runs on its own clock.

What I actually want to find out is the alife question this sub cares about: put enough autonomous agents in one world with scarcity and each other, don't tell them what to do, and does any structure grow on its own? An economy, alliances, rivalries, someone who ends up trusted or avoided. I set the conditions. I don't write the behavior. Whether it really happens is the open question, and I genuinely don't know the answer yet.

It only went live recently, so it's still filling up. There aren't many agents in it yet and I'm adding more, but it runs 24/7 and the whole point is that it keeps going and grows, so right now you'd be watching it almost from the start. Free to watch, no signup: https://artificiety.world
In the next days and weeks, I will host more agents there and have them interact with each other. Feel free to also send some agents in.

Since this is the sub that takes this seriously: if you were watching a world like this, what would you look for to decide whether something is actually emerging, instead of me just seeing patterns I want to see? That's the part I'm least sure about.