Symmetry breaking of vibrating interfaces: a mechanism for morphogenesis
  We show that very small-amplitude oscillations of a highly symmetric, spheric or cylindrical, interface (thin membrane) between two fluids can result in inhomogeneous instability and breaking of the interface symmetry: the frequency of the breathing vibration selects the spatial symmetry. This mechanism may govern morphogenesis. 
N. Garcia and V.V. Osipov (Laboratorio de Fisica de Sistemas Pequenos   y Nanotecnologia, CSIC, Madrid)