  Let f:E -> E be a homeomorphism of the plane E. We define open sets P, called
{\em pruning fronts} after the work of Cvitanovi\'c, for which it is possible
to construct an isotopy H: E x [0,1] -> E with open support contained in the
union of f^{n}(P), such that H(*,0)=f(*) and H(*,1)=f_P(*), where f_P is a
homeomorphism under which every point of P is wandering. Applying this
construction with f being Smale's horseshoe, it is possible to obtain an
uncountable family of homeomorphisms, depending on infinitely many parameters,
going from trivial to chaotic dynamic behaviour. This family is a 2-dimensional
analog of a 1-dimensional universal family.
