Żak's repertoire of forms may not be rich, but it is characteristic enough due to make his works immediately recognizable. His style inspired many Polish artists gathered around "Rhythm", a group which co-created a Polish version of Art Deco. The important feature of Żak's grammar of forms was his treatment of the human silhouette, which the painter endowed with elongated proportions that had little in common with those of the real models, a mannerist over-emphasis on contrapposto, and dance-like postures usually ascribed to marionettes or dummies rather than to people.