This extraordinary romp uses no language whatever, except gestures and grunts. When a salt crystal is dropped into a solution of water that contains all the salt it can handle, something extraordinary happens: the swift formation of large crystals of salt from the apparently clear water. When Thesroc (Michel Piccoli) rebels against the dull conformity of his life with flamboyant anarchistic splendor, the whole world quickly goes howling mad. His day starts, as usual, when his mother more-or-less drags him out of bed and kicks him out the door to go to his factory job, which supports them all. At the factory, when he is called onto the carpet, he quits (but not before fondling the boss's secretary). Back at home, he makes love to his sister and then transforms the family's apartment into a more primitive abode. The conditions of the stone-age quickly return.
~ Clarke Fountain, All Movie Guide