To help us contextualize the “mirror stage” essay, which narrates the formation of the ego and the advent of the “imaginary” in psychological life, check out this diagram:

This “knot” helps us see a few important things at once:

• there are three zones that constitute the subject:
  • the Real is roughly equivalent to the Freudian “id”: it is “unsayable” and not representable in any direct way; the infant is all “Real,” in what appears to fully-developed subjects as a chaotic space, one that Kristeva describes for us as the “chora” and which Williams James once described as a “booming, buzzing confusion”
  • the Imaginary is dominated by preverbal signs, images that are tightly bound to the figure of the mother and the desires that attach to her
  • the Symbolic is the familiar world of Saussurean “structure”: we enter the symbolic by acquiring language, and we acquire language because the “father” forbids untrammeled access to the mother to meet all our needs. For “father” we can substitute widely: God, ideology, language, morality, all the “centers” in Derrida’s sense that govern the structures we live in. We speak language with some agency, but we don’t choose the “langue”: to speak is to be a “subject” in Althusser’s sense of the linguistic order. A subject, in order to meet their desires/needs, must channel them through this structure, with all the limitations and frustrations and repressions this entails.
• These zones are only separate in theory: we don’t leave the Imaginary and Real behind when we enter the Symbolic as we acquire language. Thus the overlapping areas, which I won’t get into in any detail. But when we identify with the protagonist in a movie or respond to the seductive voice of a singer or fly into a rage at a partner’s odd habits for reasons we don’t understand, these reactions stem from these overlapping spaces. So, a Freudian slip overlaps symbolic/Real; weeping in the movies overlaps the Imaginary/Symbolic; a “symptom” in which the body is “speaking” through us (let’s say a compulsion to count to seven every time we cross train tracks) represents the crossroads of all three zones “talking at once.”