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Jacques Lacan was a French psychoanalyst who is considered one of the most influential thinkers of the 20th century. Lacan's critical theory focused on psychoanalysis, and he developed a number of concepts that have been influential in both psychoanalysis and critical theory, such as the "mirror stage" and the "imaginary order". Lacan's work has been used to analyze a wide range of cultural phenomena, including literature, film, and art.