In 1920, urged by Alberto J. Pani, the Mexican ambassador to France, Rivera left France and traveled through Italy studying its art, including Renaissance frescoes. After José Vasconcelos became Minister of Education, Rivera returned to Mexico in 1921 to become involved in the government sponsored Mexican mural program planned by Vasconcelos. The program included such Mexican artists as José Clemente Orozco, David Alfaro Siqueiros, and Rufino Tamayo, and the French artist Jean Charlot. In January 1922, he painted – experimentally in encaustic – his first significant mural Creation in the Bolívar Auditorium of the National Preparatory School in Mexico City while guarding himself with a pistol against right-wing students.
