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The Desert of the Real
The Matrix makes many connections to Simulacra and Simulation. In an early scene, Simulacra and Simulation is the book in which Neo hides his illicit software.
Morpheus also refers to the real world outside of the Matrix as the "desert of the real", which was directly referenced in the Slavoj Žižek work, Welcome to the Desert of the Real. In the original script, Morpheus referenced Baudrillard's book specifically.
Keanu Reeves was asked by the directors to read the book, as well as Out of Control and Evolution Psychology, before being cast as Neo.