The Pasolini-Lacan report is not supported by any philological evidence. However, there are striking similarities. These include the link that unites fraternity and segregation, democracy and banishment. From which the essay reconstructs the literary structure of Petrolio, compared by Pasolini himself with the novel by Mario Soldati Lo smeraldo. In particular, it highlights the role of the author who transforms himself from an almighty father into the literary game of the reader's brother.