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Sixth Sense Evolution

Propose a sixth sense that would be evolutionarily advantageous for humans today. Describe its neurological basis, the subjective experience (qualia) of using it, and the new forms of art and communication that would emerge.

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The Microbiome Sense: Chemosensus Symbioticus

Evolutionary Advantage

The ability to directly perceive microbial ecosystems—on surfaces, in air, on other people, and within one's own body. This would provide:

  • Immediate pathogen detection before infection occurs
  • Optimized food choices based on nutritional compatibility with gut flora
  • Enhanced social bonding through microbiome compatibility assessment
  • Environmental health evaluation for toxic or beneficial spaces

Neurological Basis

Primary Structures:

  • Microbial chemoreceptor organ embedded in the nasal epithelium, detecting volatile organic compounds (VOCs) and chemical signatures from bacterial metabolism
  • Gut-brain axis expansion with dedicated neural pathways from enteric nervous system to a new cortical region: the symbio-sensory cortex (between insula and somatosensory areas)
  • Lymphatic sensory neurons that monitor immune markers and communicate microbial presence throughout the body

Neural Processing: The symbio-sensory cortex creates integrated "microbiome maps"—real-time representations of bacterial landscapes much as visual cortex maps light. It cross-references with memory centers to compare current microbial signatures against healthy baselines.

Subjective Experience (Qualia)

Users describe it as a hybrid between smell and a mysterious "presence":

External sensing feels like "chromatic weather" around objects and people:

  • A healthy forest: warm amber cascade with dancing green sparks
  • A sick person: jagged purple static with gray undertones
  • Fresh food: bright blue harmonics
  • Spoiled food: sickly brown discord, sharp and recoiling

Internal sensing is experienced as "emotional weather from within":

  • Good digestion: deep golden contentment, grounding
  • Dysbiosis: scattered red anxiety in the gut
  • Immune activation: electric yellow alertness

Unlike smell (which localizes to nose), this sense has depth and dimensionality—you perceive microbial density, proximity, and temporal change (growth vs. decline).

Most strikingly, people report the sense has relational qualities—microbiomes "resonate" or "clash" with your own, creating attraction/aversion independent of visual or personality factors.

New Art Forms

1. Microbiome Murals

Artists cultivate specific bacterial cultures on large surfaces, creating living paintings. Viewers experience shifting color-presences as colonies grow, compete, and die. Gallery humidity and temperature become part of the artistic medium. Renowned works include Yuki Tanaka's "Fermentation Mandala" where kombucha cultures create months-long chromatic cycles.

2. Symphonicology

Composers create experiences by orchestrating spaces with specific microbial signatures—probiotic clouds, controlled mold growths, bacterial gardens—that audiences walk through. Like immersive theater, but for this new sense. The famous piece "Four Seasons of Decay" guides visitors through emotional journeys from birth (sterile white silence) to death (rich brown cacophony).

3. Resonance Portraiture

Instead of visual likenesses, artists create fermentation vessels or bacterial gardens that feel like specific people—capturing their unique microbiome signature. Intimate portraits might include gut flora samples. Controversial artists use disease signatures, creating disturbing works.

4. Biosculpture

Three-dimensional forms designed to be colonized by specific microbial communities, experienced from multiple angles. The sculpture's presence changes with environmental conditions—becoming a living, sensing-based kinetic art.

New Communication Forms

Microbiome Signaling

People consciously modify their microbial signatures to communicate states:

  • Dietary broadcasting: Choosing foods that create specific external signatures ("I'm eating clean" vs. "I'm celebrating")
  • Emotional honesty: Since stress/fear alters gut microbiome detectably, this sense makes certain emotional states impossible to hide—creating new social norms around vulnerability
  • Wellness indicators: Health status becomes semi-public, changing dating, hiring, insurance

Compatibility Sensing

Before deep collaboration or romance, people "resonate check"—assessing microbiome compatibility:

  • New relationship ritual: sharing a meal while sensing how foods affect both parties
  • Workspace design: teams with complementary microbiomes placed together
  • "Resonance cafés" where people mingle specifically to find microbial compatibility

The Presencing Movement

A communication philosophy holding that truth-telling requires presencing—being physically near enough to sense each other's microbial state. Political debates, therapy sessions, and reconciliation processes now emphasize proximity. Digital communication is seen as incomplete.

Bio-Poetry

A literary form where words describe microbiome sensations, creating a new emotional lexicon:

  • "Kombucha longing" (desire for beneficial presence)
  • "Sterile grief" (absence of microbial life, profound loneliness)
  • "Dysbiotic rage" (internal discord manifesting as anger)

Cultural Tensions

The Privacy Problem: Can't hide illness, pregnancy, stress, or diet. Leads to:

  • Masking technologies (probiotic sprays that confuse the sense)
  • "Sense-blind" spaces where dampening systems create microbial silence
  • Discrimination against those with "discordant" microbiomes

The Authenticity Paradox: Since internal states are now detectable, performance of emotion becomes futile, forcing new social contracts around honesty—or driving microbiome manipulation industries.

The Clean Obsession: Some cultures develop pathological avoidance of any "negative" presences, creating sterile environments that paradoxically worsen health.


This sixth sense would fundamentally alter human intimacy—we'd live in a world where invisible ecosystems become tangible presences, where truth radiates from our bodies, and where loneliness means microbial silence. Art would bloom in this new dimension, while privacy would require complete reimagining.

Generated 26th Oct 2025