Each design discipline works in its own materials, through some particular medium and deploys methods systematically in ways suited to its materials and media.
At first the distinction between material and medium is unclear. They seem ambiguous if not synonymous. An artist might speak of working in some medium, and then characterize the medium materially. But artists (at least visual artists) work mostly alone to produce a finished artifact for others to experience after the production is complete.
Designers work in teams to produce an artifact for others, and therefore must communicate intent, methodology and projected output with a far higher degree of technical precision.
But, as usual etymology helps us tease out distinctions when then sharpen on closer inspection. Material — Latin materialis, “of or belonging to matter,” from Latin materia “matter, stuff, wood, timber”. Medium — Latin medius “in the middle, between; from the middle”.
Medium is something placed between — most often in order to convey something else.
When waves travel through the water, the material water becomes the medium through which waves move. When a spiritual medium channels a spirit, a person becomes a channel conveying a message from a source beyond the individual.
Material is the substance from a thing is made — the ingredients of a thing, considered apart from its form or function.
Let us now apply this to design.
Materials are that from which a designed artifact is formed. These are include, but are not limited to physical substances.
The form itself — which must consider the materials from which it will be actualized in implementation as an artifact, but which is not yet materialized — is the design.
So what is the medium? The medium is that which conveys being through heterogeneous materials, once the designed, actualized artifact is activated — set in motion and used by people who will complete the designed system by participating it.
While we are splitting hairs, let us make another rarely acknowledged but crucially important distinction:
The essential difference between a designed artifact and an engineered artifact is a difference of ontological scope. An engineered thing is complete when all its parts function together as a system of objects. A design is only complete when its parts and participants come together in a social system of interacting subjects and objects.
An engineered system can be tested and assessed apart from their eventual contact with humans. The system is complete (and testable) prior to use by people.
A designed system can only be tested and assessed if humans take their place in the system and participate in it. Their experience and their participation are intrinsic and inseparable from the design.
Bruno Latour named systems that mingle subjectivity and objectivity “hybrid systems”, and argued that societies are irreducibly hybrid. According to Latour, any attempt to understand “the social” abstracting the subjective aspects from social systems is bound to give an incomplete or falsely complete picture of how societies are.
Design intentionally shapes social subsystems, understood to subsist within more extensive social systems. To say it again, social systems are understood as hybrids of subjective and objective being, interacting, combining and producing hybrid effects that are, more often than not, difficult to unravel into objects and subjects.
Of course, very few designers use this kind of language, or even think explicity at this depth about what they do when they design. Most adopt pidgin MBA language, enhanced with designy jargon, but the words roughly refer to shaping hybrid systems involving a range of materials that include people acting in various formal roles.
Now the medium function of design can seen clearly against the enabling materials.
Medium is concerned with the being circulating through the various materials — the being in which each participant partakes when they experience the designed system, responds to it, and interacts within it, and in so doing, contributes to the being of that system. The habitability of materials, what which affords an animating flow of life of some specific kind — this is medium.
Marshall McLuhan famously and insightfully said “the medium is the message.” What he meant was that the being of society is conducted through social systems, which draw us into distinctive kinds of participation, and shape us as people into participants of some species. This participation is the “message” of the medium, and the content we consume in this process is secondary.
So visual designers, regardless of what materials used for surfaces, pigments, dyes, light-emitters, or whatever physically conveys light patterns into a person’s eye works in the medium of visual composition.
Architects famously work in every imaginable construction material to work in the medium of space.
Communication designers, regardless of what materials convey light and sound to a person’s sensory perception works in the medium of information.
Service designers go even broader and combine every material available to an organization (a hybrid system) to work in the medium of value exchange.
And the discipline of service design — in the brief moments when it unforgets what it exists to be — carries a message of exchanging functional, emotional and social value through densely woven, intensely intended win-wins. The message is not, however, the explicit offerings, nor is it the implicit “jobs to be done” by these offering, but rather, that everything good in this world circulates through such exchanges.
The minute service designers forget this, they cease to be designers — service designers or otherwise — and become social engineering business consultants. Such designer-branded professionals may dress up in hipster costumes, but, whatever they wear, beneath the cloth, you find the same corporate stuffed suit filler.
And the message of that medium — the medium of corporate consulting — is that human beings are resources to be utilized by organizations to meet quantifiable organizational goals.
A hermetic design discipline would take seriously that design is concerned not just with form, material and function, but also, and perhaps most of all, medium. And the crucial importance of medium in the life of human beings — not only at its climactic moments, but in everyday mundanity between — might be the heart of its message.
Additional notes, Cinco de Mayo 2026:
The discipline of engineering works on many of the same materials as design. But its medium is different. The medium of engineering is control, to six sigma exactitude.
This is no argument against engineering. Engineering is indispensable. We must control some aspects of reality, often with precise exactitude. But this control must not be the sole — or even dominant — medium of social existence. ? If our organizational medium is engineered, regardless of the words it says, its message message ?cannot avoid being “submit to control”. ? Conform to your role and ?perform it consistently, efficiently and professionally. Be corporate.?
A few days ago I re-read Christopher Alexander’s classic essay, “A City is Not a Tree”. In it, Alexander contrasts two formal structures, the tree and the semilattice. A tree is how things are given to one logic. It is monostable. A semilattice on the other hand, is multistable. When a reality is invested with semilattice structure, different logics? can encounter it and perceive in it two or more different, but harmoniously related, tree structures.
Alexander makes a passionate argument that we model our ?cities on overlapping semilattice structures, because it is only in this overlapping that life emerges.? I believe this is equally true of any designed reality, especially organizations.
A semilattice supports psychic diversity, by giving the same reality in different but harmonious ways, not as social constructions? to be laboriously figured out part by part (construed), but as perceptual and conceptual gestalts, understood spontaneously as intuitive givens. Semilattice structures are shared “boundary objects” that allow people to be together in difference.?
So engineering is one tree, but it must function within a semilattice. Whatever is contained within engineering — whatever is forced to be a limb, branch or leaf on an engineered construction will be animated by merely mechanical forces.