"Before, we had to deal with gymnasts, athletes to holders of some particular relationship to the world. Now, we mainly deal with computers." (Cheng Pei-pei, interview in Cahiers du Cinema in February 2004). Metaphysics through the major genres (and open spaces) of American cinema and its golden age thanks to the shoes of the greatest dancers of Tap Dance of all time, The Nicholas Brothers trip. The actor and dancer Gregory Hines said that if one would like to do a biopic about them today, this would require CGI to replicate their dance number!