We design surfaces parametrically, which means they can be changed at any time based on the parameters given.
Example: a surface built from a set of NURBS-curves.
Example: sinus wave-parameters applied to a transformable surface.
A combination of various functions:
parametric frequency adjustment changes the appearance of “waves”
the manipulation can be faded out when it is close to the geometry edge in order to combine the design with existing geometry
the original surface is still changeable