The Argentine plastic artist Leon Ferrari and the writer Rafael Alberti met, in 1959, during the American exile of the Spanish poet. From 1962 Ferrari illustrated Alber-ti's literary compositions: in 1964 they published the joint book Escrito en el aire [Written in the air]. Both artists maintained a fluid correspondence of fine friendship. We publish five unpublished letters, addressed by Ferrari to Alberti, between 1963 and 1965, in which the argentine comments on several issues of creative interest of contemporary art: the elaboration of pictorial works, montages and installations and the controversial issues that inspire them: political and social denunciation. Ferrari vehemently confronts the war in Vietnam, the alienating, reactionary and complicit Catholic Church in perpetuating injustices and economic imbalances, and the unjust and capitalist power.