Wrinkled Embeddings
  A {\it wrinkled embedding} $f:V^n\to W^m$ is a topological embedding which is a smooth embedding everywhere on $V$ except a set of $(n-1)$-dimensional spheres, where $f$ has cuspidal corners. In this paper we prove that any rotation of the tangent plane field $TV\subset TW$ of a {\it smoothly embedded} submanifold $V\subset W$ can be approximated by a homotopy of {\it wrinkled embeddings} $V\to W$. 
Yakov M. Eliashberg, Nikolai M. Mishachev
math.GT