You're walking past a glass case in a bakery. The smell hasn't reached you yet — the case is sealed — but you look at the loaf and something in your mouth already knows the crust, the warmth, the slight sour edge of it. You taste it before you've tasted it. Now switch it around. A chef stands over a finished dish, looks at it, and tells you exactly what's in it and how it will land on the tongue. He isn't waiting for anything to come to him. He's reaching into the food, sending a thread of attention out to touch it and read it.1
Two ways of knowing the same loaf. In the first, the loaf came to you — it reflected into you and you received it without trying. In the second, you went to the loaf — you projected a feeler out and laid your awareness on it. Aurobindo gives these two routes two names. The first is vyapti. The second is prakamya. They're the two knowledge-siddhis, and the whole point of this page is to keep them straight, because in practice they blur together fast.2
Each of these has its own fuller page — Vyapti: Receptive and Communicative and Prakamya: Radiative Projective Knowledge. This page does the one thing those two can't do cleanly on their own: it sets them side by side and draws the line between them.
Here's the line. Vyapti is a mirror. The thing outside reflects into you. A state, a thought, a mood, a sensation arrives and you feel it inside yourself without having reached for it. You didn't intend it. It washed in. Aurobindo's image is literally that of being a mirror — the world stands in front of it and shows up in the glass, no effort on the glass's part.3
Prakamya is a projection. Something goes out from you. With interest and intention you enter the domain you want to know — you send a tendril of consciousness, a thread, and it goes out, touches, senses, sees, knows.4 The chef does this. So does the part of you that tastes the bread through glass: a piece of your consciousness has gone out and laid itself on the loaf.
The mnemonic carries the whole thing: vyapti = it comes to you. Prakamya = you go to it. Reception versus projection. Empathy versus intention. The mirror fills; the tendril reaches.
This distinction governs how the knowledge-siddhis are practiced and how they're recognized. If you're trying to develop the capacity to perceive, you need to know which gesture you're making — are you opening and going still so the world can land, or are you aiming and pushing out so you can grasp? They're different inner muscles even when they fetch the same fact.
In real use the two run back and forth. Aurobindo says plainly that in both cases you can go back and forth between them, and — this is the part people miss — because you're conscious, you can also modify what you perceive once you're in contact.5 Touch a state by prakamya and you can shift it; receive a state by vyapti, get conscious of it, and you can lean back along the same channel to change it. The mirror and the tendril are two doors into the same room, and once you're in the room you can move things.
That's why the bakery example cuts both ways. Standing at the glass, you might receive the taste — it floods in, vyapti, the loaf reflecting into you. Or you might reach — deliberately throw a feeler at the loaf and read it, prakamya. Same taste arrives. Different gesture produced it. The chef is mostly projecting; the hungry passerby is mostly receiving; but a skilled perceiver flips between the two without noticing the seam.
The reason vyapti works at all is oneness. You receive the world's states because, underneath, you're one with the whole — so another's mood can strike you the way light strikes a mirror, with no wire between you.6 Prakamya works because consciousness isn't trapped behind your eyes; it can extend, like a hand reaching across a room, and the senses themselves are outgoing, projecting to grasp rather than sitting back to be filled.7 One is grounded in you're already not separate. The other is grounded in your awareness can travel.
This page is the hinge that lets the whole Siddhis Hub talk about "psychic perception" without mush. The moment anyone in the vault says "I sensed something," the question becomes: did it come to you, or did you go to it? That single fork organizes a lot. It tells you which sibling page applies. It tells a practitioner which capacity is actually developing.
It also sets up the bigger structure. The receptive/projective polarity doesn't stop at the knowledge-siddhis — it recurs across the whole system. Within vyapti itself there's a receiving pole and a communicating pole (states coming in, states going out as transmission). The power-siddhis lean projective (will reaching out, in Aishwarya, Ishita, Vashita). So once you've felt the mirror-vs-tendril difference here, you can read it everywhere else in the architecture laid out in Aurobindo's Ashta Siddhi Architecture.
Take one perception and watch it arrive both ways. You're sitting across from a friend. You sense they're in distress.
The vyapti route. You weren't probing. You were just there, present, a little quiet. And their state washed into you — a heaviness that's suddenly in your own chest, a flatness in your own mood that wasn't there a minute ago. You feel it as if it were yours, because for a second the line between you thinned and their state reflected into you. You didn't decide to know they were hurting. You caught it. The tell is exactly that you can't find the moment you chose to look — it was already inside you when you noticed. That's the mirror filling.8 The danger sign, too: if you don't recognize the heaviness as theirs, you'll walk away thinking you're depressed, having quietly picked up a state that was never yours.9
The prakamya route. Same friend, same distress, different gesture. Now you go still and deliberately reach in — you put your attention on them the way the chef puts his on the dish, a feeler laid on their inner state, asking what's going on in there? You enter their domain with intention and read it. The knowledge that comes back is the same — they're in distress — but you fetched it. You sent the thread out and it came back loaded.10
Same fact. Two routes. And here's where the back-and-forth shows: once you're in contact by either road, being conscious of it, you can lean along the channel and offer a wave of steadiness back — modifying, not just perceiving.11 The knowledge was identical. The inner motion that produced it was opposite.
You're mid-conversation and a perception lands — this person is lying, or the room just turned cold toward me, or she's about to cry. Don't act on it yet. Run one check, fast, while it's fresh: did this come to me, or did I reach for it?
Feel backward a half-second. If the knowing was already inside you when you noticed it — if it arrived as a sensation in your own body, a mood that flooded in, something you found yourself already holding — that's vyapti. The mirror filled and you only just caught your reflection moving. If instead there was a little outgoing push — you'd put your attention on them, leaned in, sent a feeler and it came back — that's prakamya. You went and got it.
The difference matters in your hands. A vyapti reception you have to own as possibly theirs, not yours before you trust it — otherwise you'll mistake their fear for your own and act out a state you never generated. A prakamya reach you have to check for your own coloring — you reached with intention, and intention carries expectation, so the reading may be tinted by what you wanted or feared to find. Notice the gesture and you know which correction to make. Same perception, two diagnostics — and you can only pick the right one if you caught which way the knowing traveled.
The failure isn't that the perception is wrong. It's that you've lost track of the gesture, and so you can't correct it. Three signs.
You treat every hit as a reach. You think all psychic perception is something you do — you're always pushing out, always probing — and so you never go still enough to let anything reflect in. You've shut the mirror and you're running only the tendril. You'll catch what you aim at and miss everything that would have washed in unbidden.
Or the opposite: you treat every hit as a reception and never own your reaching. You insist "it just came to me" about readings you actually went hunting for — which means you never check them for your own coloring, because you've told yourself you didn't reach. The expectation baked into the reach goes uninspected, and you trust a tinted reading as if it were pristine.
Or — the quiet one — you absorb states by vyapti and call them yourself. Their depression is "your" depression, their anxiety is "your" anxiety, because the mirror filled and you never asked whose face it was. This is vyapti running unconscious, and it's how a sensitive person gets quietly colonized by the moods around them.9 The fix in all three cases is the same small act: catch the gesture, name the route, then apply the correction that route needs.
The whole distinction rests on one transcript passage where Sraddhalu reads Aurobindo and then states it directly: vyapti is "more like being in a mirror where the thing outside reflects in you," prakamya "more as a projection going out perceiving" — "that's the distinction between the two," with the rider that "in both cases you can also go back and forth" and "if you're conscious you can also modify."12 It's clean and it's load-bearing, but it's also one teacher's framing of one diary's vocabulary. Held as [PARAPHRASED] throughout.
Open questions the source leaves standing. When a perception arrives, can you always tell which route delivered it — or do skilled perceivers genuinely run both at once, so the question "which gesture?" sometimes has no answer? Sraddhalu says you go back and forth; he doesn't say whether the two can fire simultaneously on the same object. And: if you can modify what you perceive once in contact, where is the line between perceiving a state and causing it — does a strong enough prakamya reach plant the very distress it then "reads"? Left open.
Follow Aurobindo and you get a clean two-mode split: one perception, two named gestures, and a practice that asks you to feel which one you just made. Follow Patañjali through Saṃyama and the texture is different — there, knowledge of another's mind comes from binding attention onto an object until it yields, which feels almost entirely like the prakamya pole: you concentrate, you hold, the thing gives up its knowledge. The receptive mirror — knowledge that arrives because you went still and let it — is harder to find in that frame; saṃyama is a reaching discipline. Sit in each and you'd notice it in your body: the saṃyama practitioner is always doing something to the object; the Aurobindonian is, half the time, doing nothing and letting the object do something to them.
And much of the broader tradition just lumps it all together as "psychic powers" — siddhi as a single bin of the uncanny, listed in The Eight Siddhis. Aurobindo's move is to insist the bin has structure, and that the receptive/projective polarity is the first seam — recurring, as noted, even inside vyapti, where reception and communication are themselves a mirror-and-tendril pair. The tension isn't that one account is right. It's that lumping costs you the diagnostic: if it's all "psychic perception," you can't ask the one question — came to me, or reached for it? — that tells you what to correct.
Psychology of empathy — the affective/cognitive split. This is the strong one, because the same seam Aurobindo cuts is a well-studied fault line in how empathy actually works. Look at Empathy Neurobiology: ACC, Insula, Emotional Contagion. That page describes a mouse whose pain sensitivity rises just from watching another mouse suffer — the other's agony becoming active in the watcher's own nervous system, no choice involved, no reaching. The ACC and insula light up as if the watcher were the one in pain. That is vyapti described in neural terms: automatic, involuntary, reception-by-resonance, the other's state reflected into your body before any decision. Affective empathy is the mirror filling.
Now set beside it Theory of Mind: vmPFC and TPJ. There, the child learns to model another's mind — to reason out, deliberately and effortfully, that the other believes the cookie is in box A because they didn't see it moved. That's not resonance. That's an outgoing act of construction: you build a model of their inner state by reaching into it with intention. Cognitive perspective-taking is prakamya — the tendril going out to read a mind, recruiting a different brain network (vmPFC, TPJ) than the contagion circuit. Psychology found, empirically and with separate neural substrates, exactly the two routes Aurobindo names from the inside: affective contagion (it comes to you) and cognitive perspective-taking (you go to it). The insight neither domain produces alone: the contemplative claim that these are two practices you can choose between gains teeth from the finding that they're two systems — which means the vyapti/prakamya distinction isn't a metaphor a yogi imposed on a single phenomenon, it's a real architectural seam, and a practitioner who learns to feel which gesture they're making is learning to feel which neural system is firing. It also sharpens the empathy literature back: the contemplative frame insists you can flip between the two at will and modify what you sense once in contact — a claim of voluntary control over a split that neuroscience often treats as fixed wiring.
Attention — bottom-up capture vs. top-down direction. Look at Metsuke and Perceptual Attention. The samurai discipline names two modes of seeing: the soft, wide field (Enzan no Metsuke) that holds the whole scene and lets any movement land, and the hard narrow beam that fixes on a chosen point. That's the same polarity wearing armor. The soft receptive field is vyapti's posture — you go open and still and let the world reflect in, and the thing you needed to notice arrives unbidden at the edge of awareness. The hard directed beam is prakamya's — you aim, you project the line of attention out onto a single point and grasp it. Metsuke's core warning maps straight across: run only the hard beam and you get a costly blind spot, everything outside it vanishing — which is exactly the siddhi-failure where you treat all perception as a reach and never let anything wash in. The insight the pair produces: the contemplative and the martial traditions independently arrived at the same prescription — train both gestures and know which one you're making — and Aurobindo's "you can go back and forth, and being conscious you can modify" is the inner-perception version of metsuke's demand that the swordsman flow between soft field and hard point at will. Bottom-up capture and top-down direction, mirror and tendril, soft and hard metsuke: three names for one seam, and mastery in every case is the freedom to switch.
Sharpest implication: The most consequential thing you can know about a perception isn't whether it's true — it's which way it traveled, because the route, not the content, tells you how it can lie to you. A reception lies by being someone else's state you've mistaken for your own; a reach lies by being your own expectation you've mistaken for theirs. Catch the gesture and you know which lie to check for.
Generative questions: