The Stream of Beauty Flows Back
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Socrates — ἡ τοῦ ῥεύματος πηγή… ἵμερον Ζεὺς Γανυμήδους ἐρῶν ὠνόμασε… οἷον πνεῦμα… ἠχὼ… πάλιν φέρεται οὕτω τὸ τοῦ κάλλους ῥεῦμα πάλιν εἰς τὸν καλὸν διὰ τῶν ὀμμάτων.
Socrates gives the birth of returned love a mechanism, and the mechanism is a stream. The current of desire has a 'spring,' a pēgē, and Socrates pauses to name the current itself: it is himeros, longing — a word he has Zeus coin, in the very act of loving Ganymede, from the 'particles' of beauty that flow in through the eyes. Then comes the physics. Just as a pneuma, a breath or gust of wind, or an ēchō, an echo, strikes a smooth hard surface and is thrown back to where it came from, so the rheuma tou kallous, the 'stream of beauty,' having poured into the lover and overfilled him, rebounds and flows back again — 'into the beautiful one, through the eyes.' The beauty the boy sent out returns to the boy. He is filled with the very longing he first awakened, and without knowing it he has begun to love in return.

The beloved, filled by the lover's presence, begins to overflow — and Socrates explains the mechanism with an image that is half physics, half myth. The current of desire, which Zeus (loving Ganymede) named 'himeros,' pours into the lover; and, like a breath or an echo rebounding from a hard surface, the stream of beauty is thrown back and flows again into the beautiful boy through his own eyes. This is the birth of counter-love.
This is the passage that gives the palinode its most influential single idea: that love, truly given, comes back. Socrates could have simply asserted that the beloved eventually returns the lover's feeling; instead he builds a small machine to show why it must. Beauty, in this image, is not a static property but a rheuma, a stream — the word is built on rheō, 'to flow,' the root of Heraclitus's famous 'everything flows,' and Plato half-borrows that doctrine of universal flux to make beauty a moving current rather than a fixed quality. A current can do what a quality cannot: it can rebound. Pouring out of the beautiful boy, through the lover's eyes, it fills the lover to overflowing, and then — like a breath thrown back off a wall, like an echo returning to the voice that made it — it flows back along the same channel into the boy himself. He drinks his own beauty returned to him as longing, and so, mysteriously, the beloved falls in love. The name for what he feels is anterōs, counter-love, love-in-return; the Greeks even personified it as a god, the brother of Erōs who sees to it that love unanswered does not go unpunished. Two things are worth carrying away. First, the optics are literal: Plato, like the whole ancient world, believed sight worked by a stream issuing from the eyes, so 'love at first sight' is here a real hydraulics of gazes, beauty flowing eye-to-eye between two faces. Second, and deeper, is the moral shape of the thing. In the first two speeches love was extraction — one person angling to take pleasure from another. Here it is circulation: what the lover pours out in genuine reverence does not vanish into the beloved but returns, so that giving and receiving turn out to be the same motion seen from two ends. The lover, worshipping, finds himself worshipped; and the beloved, first only the object of love, is quietly turned into a lover too. It is the oldest and most hopeful claim about love there is — that real love is answered — and Plato is the first to try to explain the physics of why.
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