Fun question from : how to evaluate unusual new design ideas, like the very interesting tangible.media.mit.edu/project/disapp?
There are whole fields about this, of course, e.g. in social criticism (Postman, Illich, Deleuze, etc) and in HCI itself, but just unpacking my intuitions:
Conversation
Broadly, I see design as the practice of creating artifacts (abstract or physical) which carve the seams of the universe into useful or meaningful shapes, relative to some environment/situation.
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This'll be helplessly abstract, but: the artifact and the env/situation harmonize, resonate. You might see this in fitness to a particular purpose, or in the way that it changes behavior, or in people's emotional experiences, or in the way they think.

