---
title: "Collision-based logic in Lenia and its composition boundary"
authors: ["Chakshu Gupta"]
year: 2026
venue: "arXiv:nlin.CG"
arxiv: "2609.01348"
doi: null
source: "https://arxiv.org/abs/2609.01348"
topics: ["curiosity", "engines"]
seed_rank: 1548
seed_batch: "curiosity-2026-09-03"
reviewed: "2026-09-03"
pool: "engines"
relevance_score: 9
lineage: cellular-automata
cites:
  - title: "Collision-based logic in Lenia and its composition boundary"
    url: "https://arxiv.org/abs/2609.01348"
    year: 2026
    arxiv: "2609.01348"
    doi: null
see:
  - "546-theory-of-self-reproducing-automata"
  - "1456-a-zoology-of-quantum-turing-patterns"
---

# Collision-based logic in Lenia and its composition boundary

## One-sentence takeaway

Lenia's Orbium glider can do collision-based logic, but continuous CA computation hits a composition boundary that discrete Life-style circuits do not.

## Why it's lovely

Why you might love this: continuous cellular automata grow lifelike Orbium gliders that pulse while they travel — and here they finally compute by colliding. The twist is the composition boundary: gates that work in isolation do not freely wire the way Game-of-Life collision logic does. Soft-matter computing with a honesty clause.

## Key ideas

- Lenia continuous CA; Orbium is a self-propelling pulsing glider.
- Collision-based logic (as in discrete CA / billiard computers) attempted inside Lenia.
- Shows workable collision gates / interactions for Orbium-class patterns.
- Identifies a composition boundary: continuous soft collisions resist the arbitrary wiring discrete Life enjoys.

## Caveats

Not a universal computer construction; composition boundary is the headline limit. Continuous parameters are delicate — reproducibility depends on the exact Lenia rule family. Distinct from discrete GoL-on-Archimedean-lattices work in the same window.

## Implications for Broadside

Directly on Broadside's cellular-automata / falling-sand topic cluster (Noita-shaped Anoptic sims). Soft continuous agents that almost-compose is a useful warning for ECS particle automata that want Life-style circuitry.

## Links

- arXiv abs: https://arxiv.org/abs/2609.01348
- PDF: https://arxiv.org/pdf/2609.01348.pdf