The subject of this short film may be summed up in a sentence birth, life and death of an imaginary tempest on the sea side. For the "tempest" part of the film, a special effect has been done "in-camera".

By exposing the same scene three times through coloured primary filters, the colours and forms of the"moving" elements of the frame (exploding waves, foams, mists) become transformed as the static elements of the same image are reconstituted with normal colours and forms. The polychromatic effect (tri-colour technique) proposes a "vision" of the roughness and violence of the sea in tempest.