The right wall of the mural depicts the mythical and precolonial past of Mexico. The creator Quetzalcoatl appears as a threefold shape of star, god, and human being. Created by serpents, he sails through space as a star that accompanies the sun at night. Quetzalcoatl assumes a human body to teach the Aztec people as their king and patriarch. 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, Quetzalcoatl assumes the shape the morning star. The recent transformation leaves him as Tlahuizcalpantecuhtli, the star that appears near the sun at sunrise. The cycle that he undergoes signifies the continuous cycle of life. Rivera uses a simple color presentation in his origin myth.
The bright orange sun against the blue sun with an erupting volcano shows the simple, tranquil ways of life that the Mexican ancestors followed. Rivera's creation of a Mexican identity helps to continue the reform that the military created during the Revolution of 1910. Until then the Spanish oppressed any individualism from the Indians and discouraged any allusion toward the Aztec origins. Because of the oppression, the indigenous people of Mexico became part of the lower class. The mural serves as a beginning for the masses and dismisses any idea of inferiority.
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