  I am showing how the ideas behind the renormalisation group can be
generalised in order to produce the desired reduction in the degrees of freedom
other that the ones considered up to now. Instead of looking only at the
renormalisation group flow, inspiration from optimisation tools for regulators
of truncated theories is used to show that there exists another mathematical
structure in the morphisms between various renormalisation groups,
characterised by their operations, encoded by means of various regularisation
functions. This expands the idea of renormalisation group to a renormalisation
category. A group structure exists at the level of those morphisms, leading to
new information emerging in the flowing process. Impact on problems like the
naturalness and protein folding is being presented briefly.
