Slavoj Zizek and Jacques Lacan were influential 20th century philosophers who expanded upon Sigmund Freud's work in psychoanalysis. Lacan remapped Freud's theories of the id, ego and superego into the symbolic order, imaginary order and real. The mirror stage is when a child first recognizes its reflection, forming its ego through identification with the mirror image and being introduced to the imaginary order. Lacan divided the psyche into the real, imaginary order and symbolic order, which correlate to stages of development from primal need to acceptance of language and society.