A region in space-time endowed with relative permanence where observable events take place.
"Observable" events are such for living systems endowed with specific capacity of perception. As observed by J.J. GIBSON, each medium induces a defined potential specifically adapted to possible behavior for a specific living system.
Water induces specific behavior in a fish, and different ones in a swimming terrestrial mammal, or in a marine bird, like a penguin. And air induces a type of behavior in a flying bird, another in a butterfly, and another still in an aircraft's pilot. (1986, p.16-19).
A medium should be distinguished from an environment, which already implies a clear partition between some system and the non-system which whom it interrelates: such environment does not necessarily includes the whole medium.
Besides, as noted by E. MORIN: "The medium is not a stable setting, but a region where events surge"(1972, p.9).
A dynamically structured medium would be a field (see Ch. LAVILLE describing biological mechanisms considered from the atom to the living systems, 1950).
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Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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