  Small perturbations of ideal turbulence obey the Schrodinger equation.
Microscopically, the perturbation of turbulence corresponds to formation of
small amplitude helices on straight vortex filaments. A helix behaves in the
vorticity field of the fluid as a spin particle in the Stern-Gerlach
experiment. Taking into account elastic properties of the filament leads to the
Klein-Gordon equation.
