second floor. In the stairwell is a mural depicting the history of Mexico from 1521 to 1930, and covers an area of 450 m2 (4800 ft2). These murals were painted between 1929 and 1935, jointly titled "The Epic of the Mexican People". The work is divided like a triptych with each being somewhat autonomous. The right-hand wall contains murals depicting pre-Hispanic Mexico and centers around the life of the Aztec god Quetzalcóatl. Quetzalcóatl appears in the mural as a star, a god, and a human being. Created by serpents, he sails through space as a star that accompanies the sun at night. Quetzalcóatl then assumes a human body to teach the Aztec people as their king and patriarch. Last, when he sacrifices his blood to give life to men, he returns to the sky having completed his earthly cycle. Once he leaves the earth, Quetzalcóatl assumes the shape the morning star, called Tlahuizcalpantecuhtli. The cycle that he undergoes signifies the continuous cycle of life. Rivera's creation of a Mexican identity helps to continue the reform that began with the Mexican Revolution of 1910. Before this time, any individualism from the Indians was discouraged as well as any allusion toward Aztec origins. The mural aims to dismiss any idea of inferiority. In the middle and largest panel, the Conquest is depicted with its ugliness, such as rape and torture, as well as priests defending the rights of the indigenous people. The battle for independence occupies the uppermost part of this panel in the arch. The American and French invasions are represented below this, as well as the Reform period and the Revolution. The left-hand panel is dedicated to early and mid-20th century, criticizing the status quo and depicting a Marxist kind of utopia, featuring the persons of Plutarco Elías Calles, John D. Rockefeller, Harry Sinclair, William Durant, J.P. Morgan, Cornelius Vanderbilt and Andrew Mellon as well as Karl Marx. This part of the mural also includes Frida Kahlo, Diego's wife. This mural reflects Diego's own personal views about Mexico's history and the indigenous people of the country in particular. Diego also painted 11 panels on the middle floor, such as the "Tianguis of Tlatelolco" (tianguis means "market"), and the "Arrival of Hernán Cortés in Veracruz". These are part of a series depicting the pre-Hispanic era. Peoples such as the Tarascos of Michoacán, the Zapotecs and Mixtecs of Oaxaca and the Huastecs