We study the evolution of vortex filaments with corners. The dynamics is mainly self-similar as for example the one exhibited by the vortex loops created by the smoke from a cigarette or by the symmetrical pair of vortices generated behind a triangular wing. Corners seem to appear naturally in the process of reconnection of a counterrotating vortex pair.

Vortex loops created by the smoke from a cigarette

Pair of vortices generated behind a triangular wing

Reconnection of a counterrotating vortex pair