The hydraulic engine and other innovations designed to harness the power of physical energy were particularly influential as metaphors for Sigmund Freud's theory of psychoanalysis.

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Freud often used hydraulic and mechanical metaphors to describe the workings of the human mind, such as the idea of mental energy being like the pressure of water in a hydraulic system. He also compared the relationship between conscious and unconscious processes to that of a steam engine. These analogies were influenced by the technological innovations of the time, including developments in the field of hydraulics.

The Hydraulic Engine and Other Innovations Designed to Harness the Power