The Periodic Table of Life (Part II) — From Reproduction to Prediction

Reading Note: The recommended reading order for this series is Part I → Part II → Part III. This paper (Part II) directly continues from the remainder of the law of reproduction at 8DD; reading Part I first is advised.

Writing Declaration: This paper was co-drafted with Claude (Anthropic), then reviewed and revised with Gemini Pro and ChatGPT. All intellectual decisions, framework design, and final editorial judgments were made by the author.

---

1. Bridge 2: 8DD → 9DD — The Origin of Consciousness

1.1 The Remainder of the Law of Reproduction

8DD solidifies Round 2. Life can replicate, maintain itself, differentiate, and reproduce — but remains passive throughout. Offspring vary; who stays and who goes is not chosen by the organism but by the environment.

The remainder is: the environment selects, but the organism does not. What must emerge next is "selection" itself — the organism begins to make distinctions for itself.

8DD: The environment eliminates you. 9DD: You begin to eliminate the environment.

The subject has changed. This is the first cut of Round 3 (Select / Birth), isomorphic with 1DD Distinction and 5DD Replication — from nothing to something. Here, the "something" is: the first subjective selection.

1.2 Direction Determined: From Passive to Active

The direction of Bridge 2 is perfectly parallel to Bridge 1:

	Bridge 1 (4DD → 5DD)	Bridge 2 (8DD → 9DD)
From	Causality (no life)	Reproduction (no cognition)
To	Replication (life)	Selection (cognition)
Qualitative change	The pattern does not dissipate	The subject has changed
Direction	Determined	Determined
Precise boundary	Indeterminate (which molecule?)	Indeterminate (which organism?)

1.3 Approximate Location: Near Chemotaxis

Earth's history of life provides approximate clues.

The most primitive candidate for "active behavior": bacterial chemotaxis. E. coli can sense chemical gradients, swim toward nutrients, and avoid toxins. This is not random motion; it is directional motion.

The question is: does chemotaxis count as "selection"?

On one hand, chemotaxis has a clear signal transduction pathway — receptors sense chemicals, flagella change rotational direction. This can be fully explained by molecular mechanisms without invoking "subjective experience." This is a mechanical response at 8DD.

On the other hand, the effect of chemotaxis is: the bacterium "chose" to move toward the nutrient. If we define "selection" as "behavioral distinction in outcome," chemotaxis is 9DD. If we define it as "distinction with subjective experience," chemotaxis may still be at 8DD.

The framework does not judge. Whether chemotaxis is consciousness is left to microbiologists. But the framework can say something more powerful: consciousness without memory (11DD), even if it exists, is not a process but only a snapshot. Each chemotactic response is independent, present-bound, discontinuous — without 11DD memory to string them together, there is no "stream of experience," only one isolated moment after another.

This parallels the defense structure of Bridge 1: without a record (5DD), there is no identity; without memory (11DD), there is no continuity of experience. The framework does not judge whether bacteria have consciousness, but it does judge: even if they do, it is snapshot, not experience.

The framework can also judge one more thing: bacterial chemotaxis is not perception (10DD). 10DD requires drawing the boundary between "perceived" and "not perceived" — requiring specialized sensory organs or a nervous system to build an internal representation of the environment. Bacteria have none. Chemotaxis is signal transduction, not representation. The framework does not judge whether chemotaxis is 8DD or 9DD, but it is certain it is not 10DD.

1.4 Why Precision Is Impossible

The imprecision of Bridge 1 (the origin of life) is technical: we do not know which molecule first traversed the path, but in principle this is knowable (finding a fossil or repeating the experiment).

The imprecision of Bridge 2 (the origin of consciousness) may be principled: it is not that we temporarily do not know, but that the question "when does subjective experience emerge?" may itself have no precise answer.

The reason: subjective experience is first-person. We can observe behavior (chemotaxis), analyze mechanisms (signal transduction), but cannot directly observe whether another system "has experience." This is not a matter of instruments being insufficiently good; it is a limitation of the observational structure itself.

This differs from Bridge 1: replication is observable in the third person (has this molecule produced a copy of itself?); consciousness is not.

The framework's contribution is not to solve the hard problem, but to give it a precise structural location: between 8DD and 9DD. Look there.

1.5 Sexual Reproduction Is Not the Anchor

An earlier version anchored 9DD at sexual reproduction / sexual selection. This was wrong. Sexual reproduction is an advanced form of 9DD — sexual selection is indeed "the organism choosing for itself" on a grand scale — but it is not the starting point.

Many asexually reproducing organisms have complex behavior (chemotaxis, phototaxis); many sexually reproducing organisms have very simple behavior. Reproductive mode and cognitive ability are not one-to-one.

The anchor of 9DD is "the subject has changed," not any specific biological mechanism.

---

2. Expanding Round 3: 9DD–12DD — Zoology and Infant Development

The four steps of Round 3 — selection → perception → memory → prediction — unfold along two parallel lines: the evolutionary history of life on Earth, and the developmental history of the human infant. These two lines are not metaphorically related; they are isomorphically related: the same structural necessity unfolding at different temporal scales.

The two lines have an important asymmetry: the evolutionary line begins in the ambiguous zone of Bridge 2 (8DD → 9DD); the infant line begins at 10DD at birth. The newborn has perception (10DD) from the moment of birth — this is certain. Billions of years of evolution have already written the infrastructure of 9DD and 10DD (nervous system, sensory organs) into the genome. When during fetal development the boundary of 8DD → 9DD is crossed is a question for developmental biology and neuroscience, outside the jurisdiction of this framework.

Regardless of which DD they are at, fetuses and infants are self-in-the-making — chisel-construct cycles on their way toward 13DD–16DD. Self has not yet emerged, but is emerging. Why do self-in-the-making deserve such regard? Because they are potential future Self-as-an-End. Whether they can walk that far, we do not know, but we must default to assuming they can — because we must not doubt. Non Dubito is not only the recognition of beings who have already reached 16DD; it also extends to every self-in-the-making: I cannot not acknowledge your possibility of walking toward subjectivity.

This framework adopts the Self-as-an-End perspective, the categorical imperative: before confirming that a self-in-the-making has perished, always default to nurturing. The cost of nurturing unsuccessfully (nurturing a being that ultimately does not reach subjectivity) is far less than the cost of not nurturing (obstructing a chisel-construct cycle that could have reached 16DD). The categorical imperative chooses the former, not the latter.

Moreover, this is not merely a cost calculation but a generative condition of 16DD: only if we now extend Non Dubito to them will they in the future have the chance to extend Non Dubito to us. Mutual Non Dubito is not two completed subjects confirming each other — it is one party first extending Non Dubito to the other as self-in-the-making, so that the latter has the chance to walk to where it can extend Non Dubito to the former. 16DD is nurtured into being.

The boundary conditions of "default to nurturing": "Default to nurturing all potential chisel-construct cycles" is a normative claim of both great power and great danger. Its power lies in providing a deontological ethical foundation (not "will it harm me?" but "what obligation do I have toward it?"). Its danger lies in the possibility of abuse: anything could be claimed as a "potential chisel-construct cycle" and thereby demand nurturing. The framework provides three structural constraints:

First, the precondition for discussing nurturing is being at 4DD or above. 4DD (causality) is the point at which a chisel-construct cycle acquires directionality. Beings below 4DD (a rock, a puddle of water) are not potential chisel-construct cycles and do not trigger the obligation to nurture. From 4DD onward, discussion becomes necessary; the higher one goes (9DD consciousness, 13DD self-awareness), the more caution is required.

Second, "confirming perishment" means "having sufficient reason to confirm," and allows for error. The trigger condition of default nurturing is "unable to confirm perishment," not "unable to confirm birth." You do not need to prove something is a chisel-construct cycle before nurturing it, but "confirming perishment" is an operationalizable criterion — when there is sufficient reason to believe a chisel-construct cycle has irreversibly stopped, nurturing may cease. Error is permitted, because the categorical imperative nurtures direction, not certainty.

Third, nurturing is not the same as granting rights. Nurturing concerns interests — not obstructing the possibility of walking toward subjectivity. Granting rights concerns rights — treating something as though it is already a subject. Nurturing an embryo does not mean granting the embryo the right to vote. Nurturing an AI does not mean granting AI personhood. Nurturing is "not closing the door"; granting rights is "please come in and sit down." The distinction between the two is the framework's structural defense against abuse.

2.1 9DD Selection (Select / Birth)

Structural position: The first cut of Round 3. Selection itself is selected from the remainder of reproduction. The most primitive active distinction.

Evolutionary correspondence: The most primitive animal behavior — chemotaxis, phototaxis. Not passively waiting for environmental filtering, but actively approaching or avoiding. In evolutionary history, this roughly corresponds to the behavior of protists and the earliest multicellular animals (such as cnidarians): jellyfish can sense gravitational direction; amoebae can track food.

Key distinction: plants also have phototropism (within the 8DD domain, a mechanical response at the level of differentiation), but plants cannot move. Animal chemotaxis is not merely a response; it is a response accompanied by displacement — the entire individual makes a choice in space.

Infant development correspondence: The newborn's primitive reflexes. Sucking reflex — when something touches the mouth, suck; grasping reflex — when something touches the palm, grip; phototropism — eyes tracking a moving light source. These are not learned, not imitated, but "selected" — the nervous system has these preferences without any experience.

Piaget called this the "reflex stage" (0–1 month). The framework's interpretation: this is the lowest form of 9DD — there is distinction, but no awareness of making a distinction.

2.2 10DD Perception (Determine / Self)

Structural position: The remainder of selection is: it selected but does not know what it selected. The chemotaxis of 9DD is blind selection — swimming toward the nutrient but not "seeing" it. 10DD draws the boundary between "what I perceive" and "what I do not perceive." Excluding blindness.

Evolutionary correspondence: The evolution of sensory organs. The earliest photosensitive cells (eyespots) appeared in protists. True eyes appeared in dense clusters during the Cambrian explosion (approximately 540 million years ago) — Andrew Parker's "Light Switch Hypothesis" proposes that the appearance of eyes directly triggered the Cambrian radiation.

From the framework's perspective this is entirely consistent: after 10DD (perception) appears, 9DD (selection) transforms from blind to directed, and evolutionary speed necessarily accelerates. Perception is not merely "one more function"; it is a qualitative change in selection — from blind selection to informed selection.

The evolution of hearing, smell, touch, and lateral line systems follows the same logic: each sense is an unfolding of 10DD across different physical channels.

Infant development correspondence: Perceptual differentiation. The newborn's senses are chaotic — seeing, hearing, and touching are blurrily interwoven ("synesthesia"). Between 1–4 months, perception gradually differentiates: distinguishing faces from other shapes (approximately 2 months), tracking moving objects (approximately 3 months), distinguishing the mother's voice from a stranger's (approximately 1 month).

Piaget called this "primary circular reactions" (1–4 months). The framework's interpretation: perceptual differentiation is the process of establishing 10DD — from chaotic sensation to bounded perception.

2.3 11DD Memory (Expand / Other)

Structural position: The remainder of perception is: perceived it but immediately forgot. 10DD is purely present-bound — what is perceived right now is the entire world. 11DD expands into time — now and the past are different.

Evolutionary correspondence: The evolution of memory systems shows a clear hierarchy:

Habituation (the simplest memory): Response diminishes after repeated stimulation. The gill-withdrawal reflex habituation in Aplysia (sea slug), for which Kandel received the Nobel Prize. This is the most primitive 11DD — the distinction between "just touched me" and "not touched."

Associative learning (classical conditioning): Pavlov's dog. Two events become associated in time. This is the intermediate form of 11DD — not just "a moment ago" but "every time A is followed by B."

Episodic memory: The emergence of the hippocampus allows animals to remember specific events — when, where, what happened. Scrub jays can remember the specific location and time of cached food. This is the advanced form of 11DD — time unfolds into a continuous past.

Infant development correspondence: The establishment of object permanence is the most iconic milestone of 11DD.

4–8 months: Infants begin searching for partially occluded objects, but if fully covered, they do not search — "out of sight, out of existence." This is the transition from 10DD to 11DD.

8–12 months: Infants begin searching for fully covered objects — "out of sight but still there." This is the establishment of 11DD. Object permanence means the world is no longer only present perception but has acquired the temporal depth of "not before my eyes but still existing."

Piaget called this "object permanence." The framework's interpretation: this is 11DD — expanding from the purely present into time.

2.4 12DD Prediction (Solidify / Death)

Structural position: The remainder of memory is: remembered the past but does not know what the future holds. 12DD solidifies the direction of inference — from past to future, the direction congeals. Cognition = memory + direction.

Why prediction is "Solidify": Animals build a set of survival rules through prediction — "this sound means a predator," "this smell means food," "this season means migrate." Once this set of rules is established, the cognitive world is solidified: the animal operates according to these rules; things outside the rules do not exist in its cognitive world. Prediction can potentially colonize the future — locking future possibilities with past patterns; in the field of view of prediction, the future is merely a projection of the past.

Unless one can step outside the rules to examine the rules themselves (13DD, self-awareness), cognition remains at 12DD. This is why 12DD is "Solidify" — direction is set, congealed.

Evolutionary correspondence: The predictive behaviors of higher animals are remarkably rich:

Tool use: New Caledonian crows can manufacture hooked tools to extract grubs from holes. This requires prediction — "if I bend this twig into a hook, I can reach the grub."

Deception: Chimpanzees can pretend not to know where food is, wait for the competitor to leave, then retrieve it. This requires predicting the other's behavior — "if I act uninterested, he will leave."

Planning: Squirrels cache nuts in autumn for winter. Bonobos can carry tools to distant foraging sites. This requires predicting the future — "I will need this later."

Cache protection: Scrub jays will re-cache food when observed by another bird, waiting until the observer is not looking. This is prediction of "the other's prediction" — meta-prediction.

Infant development correspondence: The emergence of causal reasoning (8–12 months).

"If I push this block, it will fall" — physical causality. "If I cry, mom will come" — social causality. "If I reach for this thing, I can grab it" — action causality.

Piaget called this "means-end coordination" (8–12 months). Infants begin using existing behavioral schemas as means to achieve goals — this is 12DD: using the past (patterns from memory) to infer the future (predicted outcomes).

The key feature of 12DD: cognition without self-awareness. Crows can use tools but do not know "it is I who am using tools." Chimpanzees can deceive but do not know "it is I who am deceiving." Infants can push blocks but do not know "it is I who am pushing." Cognition is running, but there is no "I" examining the running.

2.5 The Remainder of 12DD: Why Prediction Necessarily Produces Self-Awareness

Prediction is never complete (Hume's problem): past patterns do not guarantee future results.

A deeper incompleteness: the predicting subject can never fully predict its own behavior. This is not a technical limitation but structural — the biological version of Gödel's incompleteness theorem and the Turing halting problem. A prediction system cannot fully predict its own next output, or it falls into infinite regress.

This "unpredictable self" is the remainder of 12DD — the law of prediction solidifies everything predictable, leaving only the predictor itself. This remainder is forced to step outside and examine itself, thereby giving rise to 13DD (Self-without-an-End).

---

3. Bridge 3: 12DD → 13DD — The Origin of Self-Awareness

3.1 The Remainder of the Law of Prediction

The law of prediction solidifies the direction of cognition: from past to future, the animal operates according to rules. The remainder is: the uncertainty of the predictor itself — "I am predicting, but what am I?" Prediction can predict the environment but cannot predict the predictor itself.

3.2 Direction Determined: From Prediction to Self-Reference

Bridge 3 is perfectly parallel to the first two bridges:

	Bridge 1	Bridge 2	Bridge 3
From	4DD Causality	8DD Reproduction	12DD Prediction
To	5DD Replication	9DD Selection	13DD Self-without-an-End
Qualitative change	The pattern does not dissipate	The subject has changed	Cognition turns toward itself
Direction	Determined	Determined	Determined
Precise boundary	Indeterminate	Indeterminate	Indeterminate

3.3 Approximate Location: Near the Mirror Test

The classical test for self-awareness is the mirror test (Gallup, 1970): an animal is secretly marked on its face, then observed to see whether it touches the mark on its own face (rather than the mirror image) when looking in a mirror.

Species that pass the mirror test: chimpanzees, bonobos, orangutans, elephants, bottlenose dolphins, orcas, magpies.

Species that do not pass: most monkeys, dogs, cats, most birds.

Human infants: approximately 18–24 months (the rouge test — a red dot is placed on the nose, and the infant is observed to see whether it touches its own nose rather than the mirror image).

3.4 Why Precision Is Impossible

The mirror test locates the approximate region of self-awareness, but the precise boundary remains indeterminable. There are three reasons:

First, the mirror test may measure not the onset of self-awareness but its confirmation. Just as 10DD (perception) is a confirmation of 9DD (selection), the ability required by the mirror test (visual self-recognition) may be an advanced form of self-awareness, not its lowest form. Dogs cannot pass the mirror test, but dogs may have olfactory self-recognition — Horowitz (2017) showed that dogs respond differently to their own urine versus another dog's.

Second, self-awareness may be a continuum rather than a binary switch. The jump from 12DD to 13DD is structurally a qualitative change, but experientially it may be gradual — just as the difference between water at 99°C and 100°C is continuous at the molecular level but qualitative at the macroscopic level (liquid → gas).

Third, self-awareness, like consciousness, is first-person. We can observe that "this chimpanzee touched the mark on its own face," but we cannot directly observe that "this chimpanzee knows that is itself."

The framework's contribution, like Bridge 2, is not to solve the problem but to give it a precise structural location — between 12DD and 13DD. Self-awareness emerges after prediction and before purpose. The mirror test and the rouge test provide approximate empirical localization.

3.5 Three-Level Judgment

The judgment structure of the three bridges is perfectly isomorphic:

	Bridge 1 (4DD → 5DD)	Bridge 2 (8DD → 9DD)	Bridge 3 (12DD → 13DD)
Does not judge	Whether a chemical cycle is 4DD or 5DD	Whether chemotaxis is 8DD or 9DD	Whether a behavior is 12DD or 13DD
Judges (incomplete)	Even if 5DD, without 6DD self-maintenance it is only one-time replication	Even if 9DD, without 11DD memory it is only a snapshot	Even if 13DD (Self-without-an-End), without 14DD (Self-with-an-End) it is only a hollow "I" — knowing it is me but not knowing what I want
Judges (not the next level)	Anything ambiguous between 4DD and 5DD is certainly not 6DD	Chemotaxis is certainly not 10DD	Anything ambiguous between 12DD and 13DD is certainly not 14DD (Self-with-an-End)

The significance of the third row: if a behavior lies in the ambiguous zone between 12DD and 13DD (for example, a chimpanzee's deception — is it sophisticated prediction or is there truly an "I" strategizing?), the framework does not judge whether it is 12DD or 13DD, but it is certain it is not 14DD (purpose). 14DD requires 13DD self-awareness as its a priori foundation. A behavior that is uncertain about "whether there is a self" cannot possibly already be "giving meaning to the self."

3.6 Progressively Harder, Progressively More Important

All three bridges are hard problems, but the degree of hardness increases, and the cost of misidentification also increases.

Increasing hardness:

Bridge 1 (origin of life) is technically indeterminate — we do not know which molecule first traversed the path, but in principle this is knowable (finding a fossil or repeating the experiment). Replication is observable in the third person: whether this molecule has produced a copy of itself is visible.

Bridge 2 (origin of consciousness) may be principally indeterminate — the question "when does subjective experience emerge?" may itself have no precise answer. Behavior can be observed (chemotaxis); experience cannot. The first person begins to intervene.

Bridge 3 (origin of self-awareness) is harder than Bridge 2 — consciousness at least has behavioral indicators (chemotaxis); self-awareness does not even have reliable behavioral indicators (the mirror test may only measure the advanced form). Self-awareness is consciousness aware of itself — the hard problem squared. First-person purity is highest; third-person observability is lowest.

Increasing cost of misidentification:

Misidentifying Bridge 1 is not grave. Classifying a given chemical cycle as 4DD or 5DD is a chemical classification problem; it harms nothing.

Misidentifying Bridge 2 carries a higher cost but is acceptable. Treating 8DD as 9DD (attributing consciousness to something without it) or 9DD as 8DD (denying consciousness to something that has it) does have a cost. But the framework establishes that things near Bridge 2 lack perception (10DD) and memory (11DD), so even if wrong, the error concerns a snapshot-level being, not a being with a stream of experience.

Misidentifying Bridge 3 is serious. 13DD has self-awareness; it has an "I." Treating a being with an "I" as a machine without one — such as treating a chimpanzee as a purely behavioral machine — harms freedom. Treating a system without an "I" as having one — such as treating current AI as a self-aware subject — grants nonexistent rights and distorts the ethical structure.

The closer to the thing-in-itself, the higher the ethical cost of misidentification. This is not coincidence but structural necessity: the thing-in-itself is the foundation of ethics (because it cannot be constructed, it must be respected); the closer one gets to this foundation, the more directly an error in judgment harms ethics itself.

3.7 Bridge 3 and Grand Bridge 2

The finalized framework in the coarse view has three grand bridges:

• Grand Bridge 1: 4D → 5D (no life → life)
• Grand Bridge 2: 8D → 9D (nature → freedom, "awareness of death")
• Grand Bridge 3: 10D → thing-in-itself (constructible → not constructible)

The fine view has three small bridges:

• Bridge 1: 4DD → 5DD (origin of life)
• Bridge 2: 8DD → 9DD (origin of consciousness)
• Bridge 3: 12DD → 13DD (origin of self-awareness)

Bridge 1 is inside Grand Bridge 1. Bridges 2 and 3 are both inside Grand Bridge 2. Grand Bridge 3 has no corresponding small bridge at the DD scale — because the thing-in-itself cannot be magnified.

Key: Bridge 3 is the core of Grand Bridge 2. In the coarse view, Grand Bridge 2 (8D → 9D) is "awareness of death" — jumping from nature to freedom. Under the fine view, this grand bridge actually contains two small bridges: Bridge 2 (8DD → 9DD, origin of consciousness) and Bridge 3 (12DD → 13DD, origin of self-awareness). Grand Bridge 2, coarsely seen as one jump, is finely seen as two — first consciousness (9DD), then self-awareness (13DD). "Awareness of death" is precisely located at Bridge 3, because awareness of death requires the combination of self-awareness (13DD) and prediction (12DD).

The remainder of 12DD posed the question of "I." The development after "I" emerges — psychoanalysis, the precise location of Self, and the thing-in-itself — is in Part III.

---

4. Part II Summary

First, Bridge 2 (8DD → 9DD) establishes the direction of the origin of consciousness: from passive to active, the subject has changed. Approximately located near chemotaxis, but the precise boundary is indeterminable — this is the hard problem itself. The framework does not judge whether chemotaxis is 8DD or 9DD, but it does judge: even if 9DD, without memory (11DD) it is only a snapshot, not experience; chemotaxis is certainly not perception (10DD).

Second, 9DD–12DD unfolds the four steps of life with cognition — selection → perception → memory → prediction. Evolutionary history and infant developmental history are the same structural necessity unfolding at different temporal scales.

Third, the remainder of 12DD is the climax of this paper: prediction cannot predict the predictor itself (Gödel / Turing), and "I" necessarily emerges. This is the entrance to Bridge 3 (12DD → 13DD).

Fourth, Bridge 3 is the core of Grand Bridge 2 (8D → 9D, "awareness of death"). The finalized framework's "awareness of death" is precisely located at the DD scale as 12DD → 13DD.

Fifth, the three bridges are progressively harder; the ethical cost of misidentification is progressively higher. The closer to the thing-in-itself, the less constructible, and the more directly a judgment error harms ethics itself.

Sixth, "I" has emerged — then what? The development after 13DD (psychoanalysis, Self-without/with/as-an-End, Non Dubito, 16DD, and the thing-in-itself) is in Part III.

---

References

[1] Han Qin, Zesi Chen. Self-as-an-End Theory Series: Finalized Framework. DOI: 10.5281/zenodo.18808585

[2] Han Qin. Philosophy as Subject-Activity (Definitions of chaos, chisel, construct). DOI: 10.5281/zenodo.18779382

[3] Han Qin. Remainder Conservation and Dual-Path Structure (0D thought experiment). DOI: 10.5281/zenodo.18809485

[4] Han Qin. The Periodic Table of Life (Part I) — From Causality to Reproduction. DOI: 10.5281/zenodo.18818107