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Definition structure/Maturana: a system defines the space in which it exists as a composite unit, which can be affected by interactions of its components - but the structure does not determine its properties as a unit - an unknown system cannot only be specified or determined by its structure.
Separate systems may have the same organization but different structure - structure can change, while the organization remains.
Structure/medium/Maturana: the structure of the medium produces the concrete historical sequence of influences, which select from the set of possible state sequences those that are realized.
Structure/Maturana: specifies in which structural configurations of a medium a composite unit can interact at all - without the organization getting lost.
Biologie der Realität Frankfurt 2000