 Émile Jalley showed that he had revisited certain of Freud's observations or concepts in his theoretical developments.In turn, certain psychoanalysts adapted his observations, in particular René Spitz, Donald Winnicott, and Jacques Lacan, the latter of whom highlighted the focus on "social relativity in...Wallon's remarkable work".Lacan went on to borrow and adapt the concept of the mirror stage from Wallon, who saw the child's self-recognition in the mirror around six-eight months as a key to the transition from the specular to the imaginary and the symbolic concept of the ego/I - both the Imaginary and the Symbolic providing further borrowings for Lacan.