Morphodynamics is a general theory of stationary complex systems, such
as living systems, or mental and social systems; it is based on the t
hermodynamics of physical systems and built on the same lines. By mean
s of the ergodic hypothesis, thermodynamics is known to connect the pa
rticle dynamics to the emergence of order parameters in the equations
of state. In the same way, morphodynamics connects order parameters to
the emergence of higher level variables; through recurrent applicatio
ns of the ergodic hypothesis, a hierarchy of equations of state is est
ablished which describes a series of successive levels o organization.
The equations support a cognitivist interpretation that leads to gene
ral principles of evolution: the principles determine the spontaneous
and irreversible complexification of systems living in their natural e
nvironment.