Hang two bits of metal inside a sealed jar and pump the air out. Nothing is left in there — no air, no dust, nothing you could name. They drift toward each other anyway. Gravity is still crossing that gap, and so is electrical attraction, through what you just emptied.1
So the jar isn't empty. It's empty of the things you removed, which is a much smaller claim, and the difference between those two statements is the whole of this page.
There's a state on the ladder that feels exactly like the inside of that jar, and it's one of the formless absorptions. The description is built up in stages. Start with the feeling of the sky around you, open in every direction — already far vaster and more released than the emptiness of an ordinary room. Now go further out, past the atmosphere, into the gap between planets. It feels emptier still.2
And in that state it seems as though a great emptiness is everywhere. But something is still there. Consciousness is there — the consciousness that knows this state.3 That's the flaw in the floor, and it's why this is a rung rather than the end.
The formal version is a list, and the last two are the interesting ones.
Seven elements always abide within physical emptiness: earth, water, fire, wind, space — and perception, and consciousness.4
The first five are expected. The sixth and seventh are not: perception and consciousness are being filed as things that are present in empty space, in the same list as earth and water, rather than as observers standing outside it. So empty space still contains form, still contains sensations like sound and taste, and still contains the knowing of them. Whatever "empty" means here, it does not mean vacant.
The state is also called the infinite form samadhi, which sounds like a contradiction and is a warning label.5 The point of the second name is to keep the practitioner from concluding that they've reached the end of form. The extreme of emptiness is still form. The space you're in is an aspect of form, not the absence of it.
And there's a precise correction attached to what's actually happening. It isn't that forms have been negated in this state. It's that the practitioner is not taking them to mind.6 Nothing has been destroyed. Attention has stopped landing on things, and the room that opens up when attention stops landing gets mistaken for the removal of what it stopped landing on. That's a distinction worth carrying past this particular rung, because the same substitution is available at every level: not-attending is quiet, and quiet reads as gone.
The instruction is short. Cultivate the absorption that views form as gross, and imagine that there is only space everywhere.7 Both halves are doing work. Viewing form as coarse is what makes you willing to let go of it; imagining only space is what gives the mind somewhere to be instead. It's a substitution rather than a subtraction — you don't remove the object, you replace it with an object that has almost no features. The marker is specific and modest: in this state you'll experience light, but not a brilliant light.8
That's a useful calibration. Light that overwhelms belongs elsewhere on the ladder. Here it's present and unremarkable, and a practitioner expecting the spectacular will conclude nothing happened.
The rung has a destination attached, and it changes what's at stake in mistaking it for the end. Get proficient at this state and stabilise it, and you can be reborn into the Formless Realm at the level that corresponds to it.11 The absorptions aren't only experiences. Each one is also an address, and getting very good at one is how you end up living at it.
Which sharpens the warning considerably. A practitioner who reaches the space-absorption, concludes it's the end, and settles in for years isn't merely stalled — they're qualifying for somewhere. The consequence of mistaking a rung for the summit isn't that you stop climbing. It's that you move in.
And it explains why the corpus is so insistent that every one of these states has a residue in it. If the states were just experiences, mislabelling one would cost you time. If each is a place you can be born, mislabelling one costs you the next life, spent somewhere very pleasant with the same knower still sitting in it, unexamined.
Sit, and start with the room. Notice its edges — walls, ceiling, the boundary of the space you're in. Now notice you're treating that boundary as real, and it's a convention: the space doesn't stop there, it just stops being yours.
Let it go outward. The building, the street, the sky above it. Not visualising a picture of the sky — attending to the space itself, which is continuous with the space in this room and always was.
Keep going. Past the air, out to where there's nothing between things. And notice the quality shift as you do: it gets roomier, and something in the chest unclenches.
Now the check, and it's the only part that matters. Something is registering all of this. Find it. The vastness has a witness and the witness didn't go anywhere — which means what you're in is a very large room and not the end of rooms.
Don't try to remove the witness. You can't, and the trying is the thing that keeps you at this rung. Just note it's there, and that the state is therefore not what it appears to be.
The physical argument is run twice and it's worth being exact about what it does and doesn't buy. Two metals in a vacuum jar still attract. And quantum electrodynamics says a perfect vacuum gives birth to virtual particles that are constantly born and dying, so you cannot say with certainty that space is empty.9 As physics that's roughly right and it's not being used as physics. It's being used analogically: your emptiest available idea of empty turns out to be full, therefore your meditative emptiness probably is too.
And the analogy is weaker than the doctrine it's supporting. The virtual particles are in the jar whether or not anyone's looking; the consciousness in the formless absorption is there because someone is looking, and that's a different kind of residue. The physics establishes that physical vacuum isn't nothing. It doesn't establish that the knower is a seventh element in the same sense that fire is a third.
What the argument genuinely does is rhetorical and useful: it removes the intuition that emptiness is self-evidently simple. A practitioner who has understood that a pumped-out jar is full is much harder to convince that a quiet mind is empty, and that's the transferable part.
The seven-element list is asserted without canonical citation.10 🚩 SINGLE SOURCE. The physics is used as illustration and is broadly accurate on virtual particles, though "gravity and electrical attraction" pulling two metals together in a jar conflates two very different magnitudes.
A real tension: perception and consciousness are listed as abiding in empty space, alongside earth and water. But the corpus elsewhere insists consciousness is not a thing among things and that at the highest stages mind is entirely independent of the elements. The list and that insistence pull opposite ways and neither is qualified. Open: if the state's fault is that a knower remains, what distinguishes it from the next rung up? The text names the flaw and doesn't say what removing it would consist of.
Read this as a warning and it's a rung with a trap: you'll get here, it will feel like arrival, and the tell is that something is still watching. Useful, and it keeps you moving. Read it through the other claim — that forms aren't negated here, only unattended — and something less comfortable follows. If every state on the ladder is a matter of what attention is landing on rather than what has been removed, then the ladder measures your attention rather than reality, and "higher" means less landed on rather than nearer to anything.
The corpus wants the ladder to be a map of what is, and describes it as a map of what's being attended to. Both readings survive the text and they imply different practices.
There's no honest cross-domain purchase here. The vacuum comparison is the source's own illustration rather than a shared mechanism, and building a handshake to physics on it would be doing exactly what the page criticises the argument for.
Sharpest implication: the state is not empty and the practitioner cannot tell, because the thing that would notice the residue is the residue — which makes this the one rung whose flaw is invisible from inside it by construction.
Generative questions: