 In Buenos Aires (1946) he founded the Altamira academy together with some of his students, and made public the "White Manifesto", where it is stated that "Matter, colour and sound in motion are the phenomena whose simultaneous development makes up the new art".In the text, which Fontana did not sign but to which he actively contributed, he began to formulate the theories that he was to expand as "Spazialismo", or Spatialism, in five manifestos from 1947 to 1952.Upon his return from Argentina in 1947, he supported, along with writers and philosophers, the first manifesto of spatialism (Spazialismo)**.