The Six Relationship Types Behind Every Design Choice

An earlier article in this series introduced the idea that every relationship inside a design, and every relationship a design has with the world around it, is alive: never neutral, always doing something to both sides. That article also mentioned, in passing, that the framework names six distinct patterns those relationships can take. This one goes through all six.

## Borrowed from biology, built for diagnosis

The six patterns are borrowed from the same place the framework borrows its central idea: biology, and the ways different organisms affect one another by living close together. Applied to design, they stop being a metaphor and become a working vocabulary, a set of tools for looking at an actual design system and naming what is really happening inside it, rather than assuming a relationship is fine simply because nothing has visibly broken yet. {/* cite: concept-symbiosis | the framework operationalizes symbiosis through a practical typology of six primary relationship types for diagnosing the interactions within any design system */}

Each type carries a short two-symbol notation: a plus for a side that gains, a minus for a side that is harmed, and an equals sign for a side left more or less alone. Three of the six land on the sustainable side of that ledger. Three do not. {/* cite: concept-symbiosis | the six-type typology is bifurcated into Sustainable and Unsustainable relations */}

## The three that hold up

Mutualism, notation [+,+], is the clearest win: every party involved comes away with a net benefit. {/* cite: relation_type-mutualism | mutualism describes a relationship where all interacting participants derive a net benefit; notation [+,+] */}

The framework's own case is Schoonschip Amsterdam, a floating neighborhood whose residents share a solar energy grid, electric vehicles, and communal food gardens, with continuous open-source knowledge exchange running between households. The framework presents it as an example of obligate mutualism. {/* cite: relation_type-mutualism | Schoonschip Amsterdam, a floating neighbourhood whose residents share energy, electric vehicles and communal food gardens with continuous open-source knowledge exchange, presented as an example of obligate mutualism */}

Commensalism, [+,=], is more modest: one side benefits, the other is left neither better nor worse off. {/* cite: relation_type-commensalism | commensalism describes a relationship where one organism benefits while the other is neither significantly harmed nor helped, a [+,=] interaction */}

Mark Reigelman's Reading Nest, a structure of reclaimed wood lodged inside the reading room of the Cleveland Public Library, is the framework's example of what it calls inquilinism: the installation benefits from the housing, and the library goes on doing exactly what a library does, unaffected. {/* cite: relation_type-commensalism | the Reading Nest, a nest-like structure of reclaimed wood lodged in the reading room of the Cleveland Public Library, illustrates commensalism (inquilinism): the installation benefits while the library continues its function unaffected */}

Neutralism, [=,=], describes two things coexisting with no discernible effect on each other, at least as far as anyone has checked. {/* cite: relation_type-neutralism | neutralism describes an interaction where two species coexist but have no discernible direct effect on each other; notation [=,=] */}

That last qualifier carries most of the weight. The framework treats apparent neutrality as usually an illusion of incomplete observation, and it is honest that it cannot offer one clean case of the genuine article. Its named candidates all turn out to be doing harm once you look closer: a factory discharging into a river, which turns out to actually be amensalism, not neutralism; 20th-century asbestos specification, a case of temporal myopia; and the Aral Sea irrigation diversions, a case of scale indifference. {/* cite: relation_type-neutralism | the SDF treats apparent neutrality as usually an illusion of incomplete observation; its named cases are Assumed Neutralism that prove harmful on wider analysis: a factory discharging into a river (actually amensalistic), 20th-century asbestos specification (temporal myopia), and the Aral Sea irrigation diversions (scale indifference) */}

That makes verified neutralism, actually confirmed, not merely assumed, the minimum bar a designer should be working to clear, not a comfortable default to fall back on. {/* cite: relation_type-neutralism | verified neutralism (do no harm) is the absolute minimum ethical baseline; the ethical burden of proof lies with the designer to demonstrate a relation is genuinely neutral rather than assuming it */}

## The three that do not

Competition, [-,-], is what happens when two or more parties chase the same limited resource and all of them come away worse for it. {/* cite: relation_type-competition | competition is an interaction where two or more organisms vie for the same limited resources, resulting in negative effects on all involved parties [-,-] */}

An open bid for a major architectural commission is the framework's case of what it calls institutionalized competition: several firms sink real time, money, and creative work into a proposal, one of them wins, and every other firm's investment is largely lost. {/* cite: relation_type-competition | bidding for a major architectural commission (institutionalized competition): multiple firms invest significant time, money and creative labour, only one wins, so every losing firm's investment is largely lost, a net systemic inefficiency */}

Amensalism, [-,=], harms one side while genuinely leaving the other unaffected, which is what separates it from parasitism: nobody benefits here, the harm is simply a cost somebody else absorbs. {/* cite: relation_type-amensalism | amensalism describes an interaction where one participant is harmed or inhibited while the participant inflicting the harm is not significantly affected and gains no direct benefit, the distinction from parasitism */}

The framework's case is what it calls allelopathy: a single discarded phone seems neutral, but multiplied by millions it becomes the toxic dumpsites of places like Agbogbloshie, Ghana, where the people living nearest the harm are rarely the ones who benefited from the phone in the first place. {/* cite: relation_type-amensalism | the global e-waste crisis (allelopathy): a consumer's discarded smartphone seems neutral, but replicated millions of times the exported e-waste forms toxic dumpsites such as Agbogbloshie, Ghana, causing severe harm to the local environment and residents' health */}

Parasitism, [+,-], is the one where somebody gains directly at another's expense, and the harm is demonstrable, not incidental. {/* cite: relation_type-parasitism | parasitism is a relationship where one organism, the parasite, benefits at the expense of the other participant, causing it demonstrable harm; notation [+,-] */}

Airbnb is the framework's own example of what it calls brood parasitism: the platform benefits from housing stock, infrastructure, and cultural appeal that host cities built and maintain, while converting long-term housing into short-term rentals pushes up rents and strains public services, costs the host city absorbs and the platform does not. {/* cite: relation_type-parasitism | Airbnb (brood parasitism): the platform benefits from cities' housing stock, infrastructure and cultural appeal maintained by host communities, while converting long-term housing to short-term rentals raises rents and strains public services, offloading the costs onto the host city */}

## Why name it at all

Naming a pattern is not a neutral act either. The framework judges all six against the same four mottos from the first article in this series: Ethics first and foundational, Sustainability, Social Responsibility, and Economics answering to it. A relationship does not earn the label mutualistic just because someone hoped it would be; it has to actually hold up against that compass, the same way Airbnb's platform-side gain does not make its relationship to a host city any less a parasitic one. {/* cite: relation_type-parasitism | per the Four Mottos as the fundamental criteria by which the condition of any inter-component relation is determined, Ethics is the foundational cornerstone and Sustainability, Social Responsibility and Economics are subordinate to and must align with it */}

Naming the pattern is the diagnostic step, not the whole job. What you do once you have named it is where the rest of the framework's components come in. The newsletter follows this series one piece at a time, and the Academy's foundations course is where the whole vocabulary gets put to work on a real project.