  In this note we advocate the notion of variety as juxtaposed to the notion of
complexity. Laminar flows are complex, turbulence is various. When the
gradients reach a critical point, laminar flows are subjected to instabilities
and transitions, sometime soft, sometime dramatic, and the final result is the
variety. Turbulent flows in nature are fascinating, and loosely speaking we
could say that a system is complex when differences are suffered, is various
when diversities are enjoyed and exploited as opportunities.
