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In page The Infernal Desire Machines of Doctor Hoffman:

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Doctor Hoffman – an evil, sadistic scientist akin to Doctor Faustus.[citation needed] The doctor is the antagonist and diabolical adversary of the novel. He masters physics and surpasses his teacher, the proprietor; he later uses this ability to create a new form of reality in which nothing is bound by time or the normal rules of physics. With help from his colleague Mendoza, he discovers that "eroto-energy" can power his desire machines with omnipotent and everlasting energy. He uses his desire machines to fuel energy into his new reality. Desiderio describes Doctor Hoffman's laboratory in a cinematic terms as a cross between the laboratory of the antagonist Rotwang in Metropolis and the Cabinet of Dr. Caligari.