What is the mirror stage?

Jacques Lacan, answered from the texts and cited to the page.

Jacques Lacan answers

The mirror stage is not a moment in development one passes through and leaves behind — it is a structure that installs itself and persists, the dialectic at the foundation of every subsequent formation of the ego. What happens there? The infant, whose motor capacities are not yet coordinated, whose experience of its own body is — and something of this always remains — fragmentary, discordant, in pieces, encounters an image.¹

That image is unified where the body is not. The jubilation is immediate, and it is also a trap: what the subject recognizes as itself is already outside itself, already a virtual unity projected onto a surface that returns it as other.² The ego is born in this alienation — not despite it, but through it. It is from the outside, and in an anticipated manner, that the subject first grasps his own unity.³

The consequences run further than the nursery. Every object in the human world will henceforth be structured around what I called the wandering shadow of the ego — fundamentally anthropomorphic, egomorphic even.⁴ Man's desire is never simply his own desire; it is always mediated by the image, which means it is already entangled with the desire of the other who bears a similar image.

This is what narcissism means clinically: not vanity, but the dependence of desire on an image that is never fully possessed.⁵ Men apprehend their desire only by means of the same thing that allows them to see their own nose — a mirror — and no sooner is the nose discerned than they fall in love with it.⁶ And the ego that results from this capture is not a seat of mastery.

It is a function of mastery, a game of bearing, constituted rivalry.⁷ When it speaks, it conveys the subject's discourse; when it resists, it serves as a weapon against the recognition of the unconscious.⁸ Consciousness does not reside in the ego as its native element — it is transcendent to it, grounded in the ego-ideal as unary trait, which is why the Cartesian cogito, for all its ambition, is already implicated in the very misrecognition it claims to escape.⁹

I developed the mirror stage initially as a strategic objection to the supposedly autonomous ego that ego psychology had placed at the center of its practice — the ego whose strength was to be reinforced, whose adaptation to reality was the goal of treatment.¹⁰ My argument was not merely polemical: if the ego is constituted through an identification with an image that is not the subject, then its strength is a measure of nothing except the depth of the misrecognition. To strengthen it is to work against the direction of the cure.

Sources

1. a certain level of tendencies which are experienced — let us say, for the moment, at a certain point in life - as disconnected, discordant, in pieces— and there's always something of that that remains

   Seminar II, The Ego in Freud's Theory, pp. 58–59

2. it is in this unity that the subject for the first time knows himself as a unity, but as an alienated, virtual unity

   Seminar II, The Ego in Freud's Theory, pp. 58–59

3. he only perceives the unity of this specific image from the outside, and in an anticipated manner

   Seminar II, The Ego in Freud's Theory, p. 175

4. all the objects of his world are always structured around the wandering shadow of his own ego. They will all have a fundamentally anthropomorphic character, even egomorphic we could say

   Seminar II, The Ego in Freud's Theory, p. 175

5. this passion brings to every relation with this image, constantly represented by my semblable, a signification which interests me so greatly— that is, which makes me so dependent on this image—that it links all the objects of my desires to the other's desire, more closely than to the desire they arouse in me

   Écrits, A Selection, Fink Translation, p. 139

6. their world begins at the end of their nose, and they can apprehend their desire only by means of the same thing that allows them to see their nose itself: a mirror. But no sooner has this nose been discerned than they fall in love with it

   Écrits, A Selection, Fink Translation, p. 139

7. The ego is thus a function of mastery, a game of bearing, and constituted rivalry

   Écrits, A Selection, Fink Translation, pp. 304–305

8. The ego is a means of the speech addressed to you from the subject's unconscious, a weapon for resisting its recognition; it is fragmented when it conveys speech and whole when it serves not to hear it

   Écrits, A Selection, Fink Translation, p. 139

9. consciousness is based on the ego-ideal as unary trait (the Cartesian cogito does not fail to recognize this). As a result, the transcendental ego itself is relativized, implicated as it is in the misrecognition in which the ego's identifications originate

   Écrits, A Selection, Fink Translation, pp. 304–305

10. the first strategic point I developed as an objection to the supposedly 'autonomous ego' in favor in psychoanalytic theory, whose academic restoration justified the mistaken proposal to strengthen the ego in a type of treatment diverted thereafter toward successful adaptation

    Écrits, A Selection, Fink Translation, pp. 304–305