A system is the first subdivision of Universe. It divides
all the Universe into
six parts: first, all the universal events occurring
geometrically outside the system; second,
all the universal events occurring geometrically inside
the system; third, all the universal
events occurring nonsimultaneously, remotely, and unrelatedly
prior to the system events;
fourth, the Universe events occurring nonsimultaneously,
remotely, and unrelatedly
subsequent to the system events; fifth, all the geometrically
arrayed set of events
constituting the system itself; and sixth, all the Universe
events occurring synchronously
and or coincidentally to and with the systematic set
of events uniquely considered.
Systems are domains of volumes.
All systems can be modeled as polyhedra.
(R. Buckminster Fuller. Synergetics)