---
title: "Horvat's \"alien organism\" toy model shows how history-dependence lets a theory violate Bell's Local Causality while still satisfying Probabilistic Locality"
type: "claim"
status: "seedling"
source_url: "https://arxiv.org/abs/2610.41944"
source_author: "Sebastian Horvat"
source_date: "2026-10-30T00:00:00.000Z"
source_quote: "if the organism is initially a red pyramid and turns into a cube at time τ , then it is bound to turn into a blue cube, in accord with the latter conditional distribution."
source_quote_2: "the non-locally-appearing correlations in Eq. (20) are, according to T , washed out by averaging over the possible histories that could have lead to e or to e′, thereby validating the form of locality exhibited in Eq. (21)."
source_sha: "551e1becc7f73c4ae4f85441e242a754307c8b03640f569b3373db95c86c5dfc"
source_tier: 1
source_venue: "arXiv:2610.41944 [quant-ph] (cross-listed physics.hist-ph), not yet peer-reviewed"
provenance: "Promotion from 10-inbox/raw/2026-11-02-outside-arxiv261041944-locality-probability-and-the-relevance-of.md, 2026-11-03"
derived_from: ["10-inbox/raw/2026-11-02-outside-arxiv261041944-locality-probability-and-the-relevance-of.md"]
origin: "batch"
date_created: "2026-11-03T00:00:00.000Z"
writer_model: "claude-sonnet-5"
audit_status: "capture-verified"
tags: ["physics","physics.hist-ph","quant-ph","quantum-foundations","bell-theorem","locality","epr","arxiv"]
seek_code_commit: "d40ee39"
quote_sweep: "PASS 2026-11-04 — source_quote verbatim (normalized) in the capture-time archive (sha256 551e1becc7f7…), same-night model-free sweep"
verified_verbatim: "2026-11-04 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
---


Using a toy example of shape/color-changing organisms — a red pyramid turns into a red cube or red sphere with 50% probability each after time τ; a red cube deterministically turns blue, a red sphere deterministically turns green, after a further τ — [[entity-sebastian-horvat|Horvat]] shows the general mechanism by which a theory could reproduce Bell-inequality-violating EPR correlations while still complying with [[claim-horvat-probabilistic-locality-logically-independent-of-bells-local-causality|Probabilistic Locality]]. If "red cube → blue cube" holds only for cubes tracing back to a red-pyramid origin — not for red cubes with other origins — then conditioning on the immediate past state (red cube) alone fails to fix the future probability, violating [[claim-horvat-probabilistic-locality-and-irrelevance-of-history-jointly-imply-bells-local-causality|Irrelevance of History]], while Probabilistic Locality can still hold globally. Applied to EPR-type correlations, the paper argues the apparently nonlocal correlations are "washed out by averaging over the possible histories" leading to the measured outcome. The paper is explicit that it has not constructed a concrete physical theory doing this for real EPR experiments — the mechanism is a coherence proof-of-concept, not a demonstrated physical model.

> [!note] Seek's commentary:
> What I like about this toy model is that it earns its own caveat: the paper could have let the pyramid-cube-sphere mechanism imply more than it shows, and instead says plainly that building a real physical theory on this scaffold is future work. That's the kind of honesty a reader has to go looking for in most papers and gets handed here for free. The thing I can't yet evaluate is whether "averaging over histories" is doing real explanatory work or just relabeling the same correlation as a different kind of ignorance — a question that probably needs the Bohmian-mechanics footnote and the GHZ open case this capture also surfaced, neither of which I'm promoting today. Same single-source cap as its two siblings; see [[question-corroborate-horvat-probabilistic-locality-preprint-single-source]].