# Biomimicry

Janine Benyus, *Biomimicry* (1997). Evolution has 3.8 billion years of R&D on most physical design problems. Use biological strategies as a library of mechanisms — adapt the *operative principle*, not the metaphor.

## When to use

- Physical design problems with parallels in evolved organisms (locomotion, sensing, adhesion, structure, energy capture, water management, thermal regulation, distribution)
- Materials science problems
- Distributed-systems problems with biological precedents (slime molds, ant colonies, immune systems)
- Sustainability or material-efficiency constraints

## Don't use when

- Software, social, or expressive problems where biological analogy = decoration. "Like a colony" applied to a startup is slop.
- Looking for "natural" answers to normative questions (nature is amoral)
- The biological mechanism isn't actually understood (you need the mechanism, not the headline)
- Manufacturing context can't match biology's ambient-temperature water-based assembly

## Catalog of strong precedents

**Velcro** ← burrs (*Arctium*). Many small barbed mechanical hooks. *Operative principle: many small interlocks, not one strong glue.*

**Shinkansen 500-series train nose** ← kingfisher beak. Tapered shape allows dive from air to water with minimal splash. *Operative principle: gradient-density transition reduces shock at medium-to-fluid interfaces.*

**Lotus effect** ← *Nelumbo* leaves. Self-cleaning via micro-structured wax. *Operative principle: hierarchical micro/nanostructure + low-energy surface = superhydrophobicity.*

**Gecko adhesive** ← gecko foot pads. Millions of setae adhering via van der Waals forces. *Operative principle: many small contact points + flexible substrate = strong reversible adhesion.*

**Termite mound HVAC** ← *Macrotermes* mounds maintain near-constant interior temperature in fluctuating Sahel conditions via passive convection. Mick Pearce's Eastgate Centre, Harare, 1996. *Operative principle: passive convection through engineered geometry.*

**Whale-fin tubercles** ← humpback flipper bumpy leading edges delay stall, reduce drag. Wind-turbine blades, WhalePower. *Operative principle: leading-edge perturbation alters boundary-layer behavior.*

**Slime-mold pathfinding** ← *Physarum polycephalum* solves shortest-path. Tero et al., *Science* 2010, recreated Tokyo rail network. *Operative principle: distributed reinforcement of high-flux paths, dissolution of unused ones.*

**Sharkskin antimicrobial** ← microscopic ribbed denticles prevent bacterial colonization. Sharklet hospital surfaces. *Operative principle: surface microtopology disrupts colonization.*

**Spider silk** ← *Nephila*, *Araneus*. Specific strength higher than steel; toughness higher than Kevlar. Spiber, Bolt Threads. *Operative principle: hierarchical protein assembly under shear-flow control.*

**Mussel adhesive** ← *Mytilus* DOPA-rich proteins stick to wet rocks. Surgical adhesives. *Operative principle: catechol chemistry remains effective in water.*

**Mycelial structure** ← fungus binds particles into rigid forms. Ecovative MycoComposite packaging. *Operative principle: cellulose-bonding via biological agents → biodegradable rigid structure.*

## Procedure

1. **State the problem as a function.** "I need to attach this reversibly, holding 50 kg." "I need to extract water from desert air." "I need to route packets without central coordination."
2. **Look up biological strategies.** AskNature.org is the curated database, indexed by function.
3. **Identify the operative principle.** Compress the strategy to its mechanism. Not "geckos can stick to walls" — "many small van der Waals contacts via flexible setae provide strong reversible adhesion."
4. **Match to your problem.** Be honest about what's missing — biological systems often work because of context (water, ambient temperature) your engineering context lacks.
5. **Prototype with the principle, not the metaphor.** Don't build a "robot gecko." Build something that uses the operative principle in your form factor and material set.

## Anti-slop notes

- "[X] inspired by nature" without specifics = marketing. Real biomimicry names the organism, the mechanism, and the operative principle.
- Avoid "like a colony / swarm / ecosystem" for non-physical problems. Slop magnet.
- Don't assume "natural" = "good". Parasitism, deception, exploitation are well-engineered.
- Resist the spiritual register. Biomimicry is engineering; the slop variant is greeting-card.

Source: Benyus, *Biomimicry* (Morrow, 1997). AskNature.org.
