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THEORY-036: Dennett's real-pattern criterion, compressibility against the bit map, admits almost every non-random pattern; the projectibility, perspective and scale-relativity that rainforest realism needs are later additions that do the ontological work

4 min read

Properties5
StatusProposed
Version2
Tagsmetaphysics, philosophy-of-science, information-theory, complex-systems
SourceLIT-220 — Real Patterns, LIT-219 — Patterns All the Way Up: Prolegomena to a Future Naturalized Metaphysics, LIT-184 — Effective Ontic Structural Realism, LIT-151 — Stating Structural Realism: Mathematics-First Approaches to Physics and Metaphysics, LIT-045 — Structural Realism
Bears onQUESTION-028 — When does independently generalizable, intervention-relevant relational structure warrant treating a communicative category as a real effective kind rather than an arbitrary taxonomy?

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What was actually shown

Dennett’s criterion. Dennett turns Chaitin’s incompressibility account of randomness around: “A pattern exists in some data – is real – if there is a description of the data that is more efficient than the bit map, whether or not anyone can concoct it” (p. 34). Three features follow from the text.

  • Observer-free. The criterion is an existence claim about a shorter description, not about any perspective actually having one. The “loose but unbreakable link to observers” (p. 32) is the intuition the test makes precise, not a clause of it.
  • Lossless baseline. The frames and the Game of Life are finite data with a fixed encoding. The Game of Life was chosen because “nothing is hidden from view” (p. 38).
  • Pluralist. Patterns trade compactness against noise. Two interpretations can be “different, but equally real, patterns”, with “nothing deeper” to settle between them (p. 49), and the choice is pragmatic (pp. 35–37).

So any non-random data set contains real patterns, and the criterion ranks them only by pragmatic trade-off (NOTE-190, Limitations). This is by design: it is what makes the view “mild” realism.

Ladyman’s criterion is different. “To be is to be a real pattern, where a real pattern is something that indispensibly figures in projectible generalisations” (LIT-219 p. 2). It differs from Dennett’s in three ways.

  • Real patterns are scale-relative, and ontology is “effective” (thesis 12).
  • Scientific real patterns are lossy, where Game-of-Life patterns are lossless (thesis 14).
  • The book’s definition “refers to perspectives”, because no agent can model the whole universe (thesis 15).

Ladyman lists five ways the Game of Life misleads as an exemplar. The first is that it has a privileged bit-map level (p. 3). He also says the definition can be developed information-theoretically, dynamically or statistically (fn. 5), and that the book “defines real patterns modally” (fn. 6).

Downstream, the added clauses carry the weight. Two uses depend on them. Ladyman & Lorenzetti make Newtonian forces and curved spacetime “both exist at different scales” (LIT-184), which needs scale-relativity. Wallace defines real patterns by instantiation plus the best precisification (LIT-151). That is a selection criterion Dennett’s pluralism lacks, and it disagrees with Ladyman about whether the fundamental level is itself a pattern (NOTE-191). The record’s glosses “compressibility” (NOTE-038) and “compression relative to physically possible perspectives” (NOTE-129) blur the two criteria. NOTE-190 corrects them.

What this does not say

  • That Dennett’s criterion is wrong. It does what he wanted, which is a mild realism about beliefs within Fine’s natural ontological attitude.
  • That compressibility is irrelevant to rainforest realism. The book’s definition is reported to be “articulated in information theoretic terms” (fn. 5), but it was not read.
  • That the several formulations of real patterns (information-theoretic, dynamical, statistical) agree. Ladyman leaves that open.
  • That real patterns say anything about learned representations or minimum description length. No source here draws that connection (NOTE-129, NOTE-191).

Connections

  • LIT-045 §4.4 cites Millhouse 2021 against compressibility for coarse-grained patterns. That work is not held.
  • LIT-025 and LIT-027: information decomposition gives a quantitative notion of what a coarse-grained macroscale adds. Varley & Hoel find that total information cannot rise under coarse-graining but its composition can shift toward synergy. That is a candidate precisification of “lossy but real”, and it is not drawn in any source.

Note of 2026-10-29: what holds it back

Neither Every Thing Must Go (LIT-301) nor Ross 2000 is read, so nothing held shows the projectibility, perspective or scale clause excluding a pattern that Dennett’s compressibility criterion admits. The two criteria are read in full (NOTE-190, NOTE-191); the claim that the added clauses do the ontological work is the part no held text settles.

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