Anthropometric Fossils: A Systematic Catalog of Human Cognitive Imprints in the International System of Units
Author: Rowan Brad Quni-Gudzinas | Date: 2026-07-18 | License: QNFO-ULA: https://legal.qnfo.org/
Abstract
This paper provides a systematic catalog of the human cognitive features encoded in each of the seven base units of the International System of Units (SI). For each unit, we trace the original definition, identify the specific cognitive or biological feature that shaped it, classify whether that feature is anatomically necessary, biologically contingent, or culturally accidental, and propose the genuinely observer-independent reformulation. We audit the 2019 SI redefinition and find that it relocated rather than eliminated anthropocentric choices by selecting numerical values for fundamental constants that preserve historical unit magnitudes. We compare natural unit systems (Planck, atomic, Stoney) and demonstrate that even they carry implicit observer choices. We construct counterfactual unit systems for three non-human observers (deep-sea cephalopod, gas-giant atmospheric entity, plasma-based star-dweller) to demonstrate that the SI is unrecognizable to any observer with a different body plan. An appendix provides the full cognitive genealogy of each unit. This catalog serves as the empirical foundation for the encryption hypothesis developed in the companion paper, "The Decryption Key." [speculative]
1. Introduction: Measurement as Fossil Record
Measurement conventions are fossil records of the minds that created them. Every unit choice — the magnitude, the reference substance, the mathematical divisor, the artifact material — encodes a cognitive feature of the human observer. These features are invisible to us precisely because they are the medium of our thought: we cannot see base-10 any more than a fish can see water.
This paper catalogs these fossils systematically. The methodology is reverse engineering: for each SI base unit, identify (1) the original definition, (2) the cognitive feature it encodes, (3) the necessity class of that feature, and (4) the observer-independent reformulation.
2. The Seven-Fold Catalog
UNIT 1: Meter (Length)
| Field | Detail |
|---|---|
| Original definition (1793) | 1/10,000,000 of the North Pole to Equator distance along the Paris meridian |
| Cognitive feature 1 | Decimal numeracy — division by 10^7 maps to a ten-fingered mind |
| Cognitive feature 2 | Body-scale — sized to match the aune (cloth yard), toise (fathom), human stride, and seconds pendulum |
| Cognitive feature 3 | Earth-as-reference-frame — choosing our home planet's meridian |
| Cognitive feature 4 | Euclidean geometry — meridian measured by triangulation |
| Necessity class | ALL CONTINGENT — an 8-armed cephalopod would divide by 8^7 and use arm-span |
| 2019 audit | RELOCATED — c = 299,792,458 m/s preserves old meter |
| Observer-independent | Dimensionless ratios (l/l_Planck) or adelically |
UNIT 2: Kilogram (Mass)
| Field | Detail |
|---|---|
| Original definition (1795) | Mass of 1 dm^3 of pure water at 4C |
| Cognitive feature 1 | Water as universal substance — 60% of human body mass |
| Cognitive feature 2 | Euclidean volume intuition — the cube as "obvious" shape |
| Cognitive feature 3 | Terrestrial climate — 4C = maximum density, relevant to lake freezing |
| Cognitive feature 4 | Hand-heft — ~1 kg is manually comparable |
| Necessity class | ALL CONTINGENT — silicon-based life would not use water |
| 2019 audit | RELOCATED — h = 6.62607015x10^-34 J*s preserves old kilogram |
| Observer-independent | me/mp ~ 1/1836, me/mPlanck ~ 4.2x10^-23 |
UNIT 3: Second (Time)
| Field | Detail |
|---|---|
| Pre-1967 definition | 1/86,400 of the mean solar day |
| Cognitive feature 1 | Circadian rhythm — 24h = sleep-wake cycle |
| Cognitive feature 2 | Heartbeat — 1s ~ 1 resting pulse |
| Cognitive feature 3 | Sexagesimal inheritance — 24x60x60 = Sumerian base-60 |
| Cognitive feature 4 | Planetary rotation — tied to Earth's specific spin rate |
| Necessity class | ALL CONTINGENT — 10-hour-day planet would define very different second |
| 2019 audit | RELOCATED — Delta-nu_Cs = 9,192,631,770 Hz preserves old second |
| Observer-independent | Planck time t_P ~ 5.39x10^-44 s; dimensionless time ratios |
UNIT 4: Kelvin (Temperature)
| Field | Detail |
|---|---|
| Pre-2019 definition | 1/273.16 of the thermodynamic temperature of the triple point of water |
| Cognitive feature 1 | Water triple point — exquisitely terrestrial (273.16 K, 611.657 Pa) |
| Cognitive feature 2 | Human temperature band — 1 K = 1/100 of water liquid range at 1 atm |
| Cognitive feature 3 | Atmospheric pressure — boiling point depends on pressure |
| Necessity class | ALL CONTINGENT — Titan's methane lakes would define temperature by CH4 transitions |
| 2019 audit | RELOCATED — k_B = 1.380649x10^-23 J/K preserves old kelvin |
| Observer-independent | beta = 1/(k_B T) in natural units |
UNIT 5: Mole (Amount of Substance)
| Field | Detail |
|---|---|
| Pre-2019 definition | Number of atoms in 0.012 kg of carbon-12 |
| Cognitive feature 1 | Gram-to-amu bridge — 1 mole C-12 = 12 g maps atomic to lab scale |
| Cognitive feature 2 | 12 grams — convenient human-handling quantity |
| Necessity class | ALL CONTINGENT |
| 2019 audit | RELOCATED — N_A = 6.02214076x10^23 preserves convention |
| Observer-independent | Direct particle count; dimensionless |
UNIT 6: Candela (Luminous Intensity)
| Field | Detail |
|---|---|
| Definition (1979) | Luminous intensity weighted by human photopic spectral sensitivity V(lambda), peak 555 nm |
| Cognitive feature 1 | Trichromatic cone vision — peak at 555 nm = daytime color vision |
| Cognitive feature 2 | Day-biased — cone not rod vision (~498 nm) |
| Cognitive feature 3 | Species-specific — bees see UV, snakes IR |
| Necessity class | ANATOMICALLY SPECIFIC — explicitly tied to Homo sapiens retina |
| 2019 audit | UNCHANGED — most honest SI unit |
| Observer-independent | Radiometric flux (W); species-independent |
UNIT 7: Ampere (Electric Current)
| Field | Detail |
|---|---|
| Pre-2019 definition | Force of 2x10^-7 N/m between parallel conductors 1m apart |
| Cognitive feature 1 | Inherited from meter + kilogram + second — all anthropocentric |
| Cognitive feature 2 | 2x10^-7 — decimal fudge factor for backward compatibility |
| Necessity class | INHERITED CONTINGENCY |
| 2019 audit | RELOCATED — e = 1.602176634x10^-19 C preserves old ampere |
| Observer-independent | Fine-structure constant alpha ~ 1/137 — dimensionless |
3. The 2019 Redefinition: A Systematic Audit
3.1 The Pattern
The 2019 redefinition fixed seven "defining constants": Delta-nuCs, c, h, e, kB, NA, Kcd. For each constant, the numerical value was chosen to ensure continuity — the new definition produces units indistinguishable from the old ones.
3.2 Continuity as Cognitive Inertia
The cost of continuity: The numerical values of the defining constants now permanently enshrine the anthropocentric choices of the 18th-20th centuries. 6.62607015x10^-34 is not a fundamental fact about nature — it's an artifact of defining h such that the resulting kilogram matches the mass of 1 dm^3 of water at 4C.
3.3 The Natural Constants Facade
The SI now presents a "natural constants" facade — but the floor plan behind the facade is still the cognitive architecture of an 18th-century French revolutionary with ten fingers. The encryption has moved from the definitions to the constants.
4. Natural Units: An Incomplete Solution
Planck Units
Planck units are conceptually natural but operationally still expressed in meters/kg/seconds. The Planck mass (~22 ug) is too small to handle and too large to be atomic.
Atomic Units (Hartree)
Electron-centric — why not muon or tau? Because electrons form atoms, atoms form chemistry, chemistry forms us.
Verdict
Even natural unit systems carry implicit observer choices. Dimensionless ratios are genuinely observer-independent.
5. Counter-Factual: Non-Human Unit Systems
5.1 Deep-Sea Cephalopod
| Human Feature | Cephalopod Feature | Consequence |
|---|---|---|
| 10 fingers | 8 arms | Base-8, not base-10 |
| Trichromatic vision | Polarization-sensitive | No "candela" |
| Air medium | Water medium | No water density standard |
5.2 Gas-Giant Atmospheric Entity
| Human Feature | Entity Feature | Consequence |
|---|---|---|
| Solid surface | No surface | Length = atmospheric scale height (~20-30 km) |
| 300 K body temp | 130-170 K | Temperature by NH3/NH4SH/H2O condensation |
| 24h day | ~10h rotation | Time unit = 10h |
5.3 Plasma-Based Star-Dweller
| Human Feature | Entity Feature | Consequence |
|---|---|---|
| 300 K | 5,800-15,000,000 K | Temperature in keV |
| ~1s heartbeat | ~10^6 s convection | "Second" would be weeks |
| Molecules | Fully ionized plasma | No mole concept |
5.4 The Implication
The SI is a unit system for one specific observer — a ten-fingered, water-based, ground-walking, visually-oriented, ~310 K, ~70 kg, ~1.7m, 1-atm-breathing, 24h-circadian ape from Earth.
6. The Cross-Ratio Formalization
- A = physical phenomena (Earth's meridian, water's density, solar day)
- B = mathematical divisors (10^7, 86,400, 273.16)
- C = metrological artifacts (platinum bar, kilogram cylinder, cesium clock)
- D = Homo sapiens cognitive architecture (ten fingers, 60% water, ~1s heartbeat, ~310 K)
The cross-ratio is invariant only because D is never varied. The adelic product formula eliminates D entirely.
7. Catalog Summary
| Unit | Cognitive Origin | Necessity | 2019 Status | Independent Form |
|---|---|---|---|---|
| meter | Earth meridian / ten-finger radix | Contingent | Relocated | l/l_Planck |
| kilogram | Water density (our bodies) | Contingent | Relocated | m/m_e |
| second | Circadian rhythm, heartbeat | Contingent | Relocated | t/t_Planck |
| kelvin | Water triple point | Contingent | Relocated | beta = 1/(k_B T) |
| mole | Gram-to-amu bridge | Contingent | Relocated | Direct count |
| candela | Human retinal sensitivity | Species-specific | Unchanged | Radiometric flux |
| ampere | Inherited from mkgs | Inherited | Relocated | alpha ~ 1/137 |
All seven SI base units are anthropocentric. The genuinely observer-independent quantities are dimensionless ratios and the adelic product formula.
Appendix: Full Cognitive Genealogy
A.1 The Meter
- 1668: Wilkins proposes "universal measure" based on seconds pendulum
- 1791: French Academy defines meter as 1/10^7 of Earth meridian quadrant
- 1799: Platinum meter bar deposited in Archives
- 1889: International Prototype Meter (Pt-Ir bar) at BIPM
- 1960: Krypton-86 wavelength definition
- 1983: Speed of light definition (c = 299,792,458 m/s)
- Cognitive origin: Decimal division of Earth's body-scaled circumference
A.2 The Kilogram
- 1793: Grave defined as mass of 1 dm^3 water at 0C
- 1795: Gram defined as 1 cm^3 water at 4C; kilogram = 1000 grams
- 1799: Kilogramme des Archives (platinum cylinder)
- 1889: International Prototype Kilogram (Pt-Ir cylinder)
- 2019: Planck constant definition (h = 6.62607015x10^-34 J*s)
- Cognitive origin: Water — the substance we are made of
A.3 The Second
- Ancient: Solar day divided by 24x60x60 (Sumerian base-60)
- 1670: Seconds pendulum proposed as length standard
- 1956: Ephemeris second (tropical year 1900)
- 1967: Cesium-133 hyperfine transition (9,192,631,770 periods)
- Cognitive origin: Earth rotation period / heartbeat-approximating interval
A.4 The Kelvin
- 1702: Amontons proposes absolute zero
- 1848: Thomson (Kelvin) proposes absolute temperature scale
- 1954: Triple point of water (273.16 K)
- 2019: Boltzmann constant (k_B = 1.380649x10^-23 J/K)
- Cognitive origin: Water's phase diagram on Earth
A.5 The Mole
- 1811: Avogadro's hypothesis
- 1971: Mole becomes 7th SI base unit
- 2019: Avogadro constant (N_A = 6.02214076x10^23)
- Cognitive origin: Bridging atomic and human-handling mass scales
A.6 The Candela
- 1948: Candela based on platinum freezing point
- 1979: Monochromatic radiation definition (540 THz, 1/683 W/sr)
- Cognitive origin: Human retinal sensitivity curve V(lambda)
A.7 The Ampere
- 1820s: Ampere's force law
- 1893: International ampere (silver deposition)
- 1948: Absolute ampere (force between parallel conductors)
- 2019: Elementary charge (e = 1.602176634x10^-19 C)
- Cognitive origin: Inherited from meter, kilogram, second
End of Paper 2 — Anthropometric Fossils