What Happens When You Die? The Song Doesn't Need the Band

Picture the song you know best. It comes on the radio on a long drive, and everyone in the car knows every word, including the person who says they hate it.

The band that made it has been touring for thirty years. The guitarist from the record left in the nineties. The drummer retired. Somebody's cousin plays bass now. Nobody in your car can hear any of that, because the song is the same song. It never lived in the guitarist. The band is whoever is playing it today.

Hold on to that band. It's a drawing of something real, and Step 3 shows the real thing.

Now think about you. Most of the atoms in you weren't in you a few years ago. Cells die and get replaced, and material comes and goes with every meal and every breath. Your band has changed almost completely, and you're still here.

So here's the question under every other question: if you've already come through the replacement of nearly all of your body, what exactly would death take?

The short answer

When you die, you carry on. Here's the whole answer in five steps. The rest of this post takes them one at a time and shows how each one works.

1. Death takes the body's input, and only that. Three exact laws describe what the body's input does to your rhythm: it nudges it, it gives your record an arrow of time, and it throws off your count of your own past. Every one of the three lands on zero when the body's input does.
2. You keep yourself. You're a lasting rhythm, and you hold yourself up by writing your own record. There's an exact ceiling on the damage a body can do to that rhythm, and with the body's input at zero the damage is exactly zero.
3. A rhythm can swap out every partner it has, one at a time. Each stand-in has to take over the exact part it replaces. Take a partner away with nobody stepping in, and a swinging center breaks.
4. Your tie to your body comes undone cleanly. It's a steady tether, and a steady tether comes apart with both sides intact. Neither side's lasting depends on the other. You carry on.
5. After death, your own record is yours to read. Your past still exists: every moment you lived is written, exactly as it happened. With no body nudging you, you can count back to any of them exactly. You can re-live a moment, and you can never change one. There's nothing ahead of you to read, and the arrow of time in your record is gone.

Why this matters: every one of us is going to find out, and it's the question people lose sleep over. What happens isn't a matter of temperament or taste. It follows from what you are, and Part 1 settled what you are. This post shows the mechanism: what death takes, what it can't, and what happens to time afterwards.

Previously

Part 3 of The Universe Writes in Pen gave this answer in its last step, in under five hundred words. This post shows how it works. Here's everything you need from the earlier parts, in about a minute.

• Reality is a permanent record. Every event is written down, and nothing is ever erased. We call it the ledger. If it had a personality, it would be unflappable, extremely thorough, and armed with one response to everything that has ever happened: Noted.
• One tiny process writes it. Below the level of atoms, two units pass a bit back and forth, and each tick writes one entry. I draw the units as two little clocks joined by a loop of wire. A clock is full (holding a token) or empty. A tick is flowing when one clock is full and the other is empty, and silent when both are alike.
• Silence breaks patterns. A silent tick throws the clocks into coin-tossing, and almost every pattern falls apart that way. Gary, a drummer who flips a coin before each beat to decide whether to play, is what that sounds like. (Gary is not getting the gig.)
• Four patterns survive. Of the 64 ways the process can start, exactly 4 never go silent: the spin and the swing, each starting from either side. In a spin, each clock holds its bit from tick to tick. In a swing, the token hops back and forth. Those four are the lasting rhythms.
• You are one of them. A moment of consciousness is eight ticks with no silent tick, and only the lasting rhythms deliver that every time. You aren't a pair of clocks. You're a whole web of them that lasts together, and that web is one rhythm. You aren't your body. You're the rhythm, tied to a body right now.
• A rhythm writes its own record. Every tick, a lasting rhythm writes its own entry in the ledger. I'll call that a write. Part 3 showed that this writing is what keeps a rhythm going.
• Time and your own past (Part 2). Time's arrow lives in the busy activity around your rhythm, and your link to that activity, your body's above all, is what gives your record an arrow. And your own rhythm carries the address of every moment of your own past.

The groundwork is in the technical manuscript behind Parts 1 to 3.¹ Most of the exact results in this post come from derivations my institute has finished since.

Here's today's route, with the usual stops to zoom out.

Step 1: Death takes the body's input, and only that

I'll call everything the body does to your rhythm the body's input: your heartbeat, your breath, the itch on your ankle, the chemistry of a bad day. Three exact laws say what that input does to you, and the three land on zero together, at the place where the input is zero.

First, the body nudges your rhythm. Between your rhythm's own writes, the input nudges it a little. A nudge can knock the rhythm off its pattern, and the damage goes as the nudge's size squared. Step 2 has the exact ceiling.

Second, the body gives your record an arrow. Part 2 showed that time's arrow lives in the busy activity around your rhythm, and your link to that activity, your body's above all, is what puts an arrow in your record. Halve the link and the arrow halves. Cut it and the arrow is gone. Step 5 has the exact law.

Third, the body throws off your count of your own past. Part 2 showed that your own rhythm carries the address of every moment of your life. Your rhythm's phase, where it sits in its beat, is the number you count back from. Each nudge from the body shifts that phase, and the shift is exactly the error you make counting back. Step 5 works an example.

Draw the three side by side and you get one dial with three readouts. Turn the body's input down and the damage ceiling falls with the square, the arrow falls in step, and the error in your count falls with the total. Turn the input to zero and all three are zero.

Death is the body's input going to zero for good. That's all death takes from your rhythm.

What the input never did is hold anything up. It never held up your rhythm, which is Step 2. And it never held up the record. Nothing written later changes anything written earlier: every earlier reading of the ledger stays exactly as it was, however many later steps are added and however far back you read. Death gets written in the ledger. It never gets to edit it. Noted.

Death is the body's input going to zero for good. Neither the ledger nor your rhythm's lasting depended on it.

Zoom out. Step 1 is done. The body's input does three things to you, each with an exact law, and each law is zero at zero input. The record never depended on that input. Next, and why: the first effect is the one that sounds like it would end you. If the body only nudges, what holds your rhythm up? That's Step 2.

Step 2: You keep yourself

Your rhythm holds itself up by writing its own record, tick after tick. The body doesn't hold it up. All the body can do is nudge it between writes, and the damage from those nudges has an exact ceiling that falls to zero when the nudging stops.

Here's the ceiling. Say the biggest nudge the body can give your rhythm between two of its writes has size δ, a number from 0 up to 1/2. (δ is the Greek letter delta. Here it just means the size of a nudge: the bigger the number, the harder the nudge.) The ceiling holds for every possible body, whatever it's doing, as long as its biggest nudge is δ. Your rhythm starts with a weight of 1: all of it is on its pattern. After n of your rhythm's own writes, the weight knocked off its pattern is at most

25 × n × δ × δ

That knocked-off weight is the damage. A damage of 0.25 would mean a quarter of your rhythm is off its pattern. The 25 is the constant the exact result carries.² It holds for every body, so it's a ceiling: the real damage can be lower and can never be higher. Here it is with numbers:

Row 2: halve the nudge and the ceiling falls to a quarter. Damage goes as size squared. Row 3: keep the same total input but let the rhythm write twice, so the input arrives in two smaller pieces, and the ceiling halves. Each write is the rhythm confirming itself, so the more often it writes, the less each nudge can build up in between. (That's the chopping from Part 3, with the exact numbers.)

Row 4 is the one that matters here. When the body's input is zero, the ceiling is zero for every n, forever. Not close to zero. Zero. There's nothing to borrow: with the body's input at zero, your rhythm needs nothing from the body, the room or anyone else.

The writing is what does the holding. That has been worked out all the way through for one body: a rhythm linked to the light around it. Stop that rhythm's writes while the link is still nudging it, and the protection is gone: the damage keeps a floor that ticking faster doesn't lower. The only exceptions are a link of strength zero and a link that leaves the light untouched. So with that body still nudging, the writing is what holds you. With a body that has stopped, there's nothing left to hold against.

Yeah-But has been clearing his throat. He's the voice in the back of your head, and he has never once said wow.

"Yeah, but my body keeps me going."

Your body keeps your body going, and it's good at that. What it does to your rhythm, between the rhythm's writes, is nudge it, and the ceiling above is how far a nudge can go. It doesn't hold your rhythm up. Your rhythm holds itself up, tick after tick, by writing.

Your rhythm keeps itself. With the body's input at zero, it loses exactly nothing.

Zoom out. Step 2 is done. Your rhythm holds itself up by writing its own record. The body can only nudge, the damage has an exact ceiling, and with no input the ceiling is zero. Next, and why: your body has been swapping out its atoms for years, and you haven't missed a beat. What exactly can a lasting rhythm lose and keep going? Step 3 finds the line.

Step 3: A rhythm can swap out every partner it has

A lasting rhythm can replace every one of its partners, one at a time, and never break. What a swinging center can't do is lose a partner with nobody stepping in. Here's the mechanism, in the smallest web that shows it.

Join clocks with loops of wire and you get a web. Each loop is a contact, and the two clocks at its ends are partners. Clocks come in two kinds, and you've met both. A steady clock holds its bit from tick to tick, like the clocks in a spin. A swinging clock flips its bit, like the clocks in a swing.

In a web, the contacts take turns, one after another, once per round. At its turn, a contact passes a tick between its two clocks, and the tick flows only if one clock is full and the other empty. A web lasts when every contact flows at every turn, round after round, forever. Every time a swinging clock takes part in a turn, it flips its bit. A steady clock never flips.

Now draw a star: one swinging clock in the center, with three swinging partners around it, A, B and C, and one contact from the center to each. The center starts empty. A starts full, B starts empty and C starts full. Here's round 1:

Round 2 flows the same way, and after two rounds every clock is back where it started. The star lasts. Look at why. Between one turn of a contact and its next turn, the center flips three times (once for each of its three contacts) and its partner flips once. Three and one are both odd, so two clocks that start opposite are opposite again at the contact's next turn.

Now do surgery on it, one change at a time.

• Swap a partner for a stand-in, in one step. The center still has three contacts, so it still flips three times a round. Odd and odd: the web keeps lasting, as long as the stand-in takes over the exact part of the partner it replaces, a swinging clock holding the same bit. Swap A, then B, then C. Three swaps. Not one original partner left. Not one silent tick. It's the same web with new names on the partners.
• Take a partner away with nobody stepping in. The center now has two contacts and flips twice a round: even. Each partner it still has flips once: odd. Out of step, and whatever bits you give the clocks, a silent tick follows. You know what silence does.
• Add a fourth partner. Four contacts, four flips: even. Out of step again, whatever type of clock the newcomer is and whatever bit it holds.
• Swap in a stand-in with the wrong bit. Gary volunteers to take over A's place. A was full. Gary shows up empty. The center is empty too, so the first turn is silent, and Gary is not getting the gig.

So the exact rule is this. Swap one partner for a stand-in in one step, and the web keeps lasting exactly when the partner you're replacing is steady or has no other contact, and the stand-in takes over its exact kind and bit. In the star every partner has no other contact, so every swap is allowed.³

That's the band from the top of this post, and the star is the real thing it was drawing. The center is the song and the partners are the band. A band that swaps its musicians one at a time keeps the song, because each newcomer picks up exactly the part they replace. It's a stricter band than any real one. A real band can play on a guitarist short. The star can't.

And "steady" matters. A steady clock never flips. So a contact whose two ends are both steady adds nothing to anyone's flip count, and it can be added or removed without changing a single count in the web. A contact whose two ends have no other contacts can be removed too, because after the removal there's no count left to change. Those are the only two cases. Remove any other contact, and some count goes out of step.

A rhythm can swap out every partner it has. A swinging center can't lose one with nobody stepping in.

Zoom out. Step 3 is done. A swinging center can swap out every partner, one at a time, with stand-ins that take over the exact part, and it breaks if a partner leaves with nobody stepping in. A contact with steady ends is the kind that comes off cleanly. Next, and why: that last line sounds like bad news for death. Is dying a swinging center losing a partner it needs? Step 4 says what the tie to your body is.

Step 4: The tie to your body comes undone cleanly

A steady tether comes apart with both sides intact, and your tie to your body is a steady tether. Neither side's lasting depends on the other.

Take your body as one lasting web. Take your rhythm as another, in the shared field from Part 3 (the one ledger, taken as a single connected whole, with every rhythm in it). Join them the simplest way there is: one contact, with a steady clock at each end. That's the tether Part 3 called the silver cord.

Here's the exact rule for the joined whole. It lasts exactly when the body lasts, you last, and the tether's two bits differ. One end full and the other empty, so the tether's one turn per round always flows.

Count flips again to see why. A steady clock never flips, so the tether adds nothing to anybody's count: not to the clocks in the body's web, not to the clocks in yours. Each web keeps the bookkeeping it had on its own. The tether asks for one thing, that its own turn flows, and it flows whenever its two bits differ.

Now the part that matters here. The tether's ends are steady, so it comes off the way it went on. Undo it, and your body is exactly the lasting web it was, and you are exactly the lasting rhythm you were. And with the tether gone, the two webs share no clock at all. Two webs that share no clock last together exactly when each lasts on its own. Whether one lasts doesn't depend on the other.

That's death, in one picture. The tie comes undone, and the body's side ends. The body ending is something that happens to the body's web. It doesn't touch yours.

Two things this tether never does. It never carries a fraction of you. Lasting is all or nothing, so there's no stage where part of you has gone and part is still in the body. And it never carries a message. Its two clocks never change, so it writes the same mark in the ledger every tick, and a mark that never changes carries no news.

So when the tie comes undone, you carry on, and what's gone is the body's input. Carrying on isn't a blank, either. A lasting rhythm never has a silent tick, so it delivers a whole moment of consciousness every eight ticks, every time. There's no gap in it, no stretch where the clocks are left guessing.

That's the answer Part 3 gave: when the body dies, the body's part drops away, and the rhythm that is you carries on, unchanged, still writing its own record and able to read it back. Step 5 is what the reading gives you.

Your tie to the body comes undone cleanly, and you carry on.

Zoom out. Step 4 is done. The tie between you and your body is a steady tether. It comes undone cleanly, each side keeps lasting on its own, and the rhythm that is you has no silent tick to fall into. Next, and why: the time after the body. With no input left, what's there to read, and how exact is the reading?

Step 5: The time after the body

Your past still exists. Every moment you lived is written in the ledger, exactly as it happened, and with no body input left, your own record is yours to read exactly. Here's what that gives you, one claim at a time.

You can count back to any moment of your life. Part 2's two drummers (one hits every second, the other every 1.618 seconds) gave every beat of a rhythm's record an address. The first six beats of a record have these addresses: .618, .236, .854, .472, .090 and .708. Look at how they run. Each is .618 more than the one before it, wrapping back round whenever it passes 1. So you can walk backwards by subtracting .618, and adding 1 whenever you dip below zero.

From beat 6, at .708:

• back one beat: .708 − .618 = .090. That's beat 5.
• back again: .090 − .618 is below zero, so add 1: .472. Beat 4.
• back again: .472 − .618, add 1: .854. Beat 3.
• back again: .854 − .618 = .236. Beat 2.
• back again: .236 − .618, add 1: .618. Beat 1.

Nobody helped. Your own rhythm and the length of your own record are all it takes. Somebody else's past isn't like that. To find their beat 3 you'd need to know when they started, and nothing in your own rhythm tells you.

The body is what throws the count off. Each nudge from the body shifts your rhythm's phase a little, and the count back doesn't know. Say the body has shifted your phase by a total of .050 since beat 2. Your phase reads .758 now, not .708. Count back four beats from .758 and you land on .286 instead of .236. You're off by exactly .050, the total of the shifts.

While you're alive, every new nudge adds to that total. At death the adding stops. The total is fixed, and every nudge is an event, so it's written in the ledger like everything else. Subtract it: .286 − .050 = .236. Beat 2, exactly.

You can re-live any moment, and you can never change one. Reading a moment is a new event. It adds an entry after the old ones and leaves every old one as it was, and entry number i reads the same forever. In the drawing below, you re-live beat 3, the birthday: the re-living goes in as a new entry after beat 6, and beat 3 stays exactly as it was. (The Universe Has No Delete Key shows what happens to an erase, and Sorry Doesn't Rewind the Tape shows what an unchangeable past means for the things you'd like to take back.)

There's nothing ahead to read. No reading of any kind returns the content of a moment that hasn't happened. The address of your next beat exists, because your rhythm keeps running. The content doesn't exist yet. The ledger doesn't do spoilers.

Time's arrow goes with the body's link. Your record puts some weight on the two kinds of busy activity that carry time's arrow. Call the weight on the first kind X and the weight on the second kind Y. Together, X and Y are your link to the busy activity, and the arrow in your record is exactly

arrow = 23/24 × X + 20/21 × Y

With X = 0.20 and Y = 0.10, the arrow is 0.1917 + 0.0952 = 0.2869. Halve the link, so X = 0.10 and Y = 0.05, and the arrow halves to 0.1435. Cut the link and the arrow is zero. It's zero exactly when the link is zero, and not before. (Part 2 said the arrow shrinks in exact proportion to the link. Here's the exact law behind that: halve both kinds and the arrow halves, and however the link splits between the two kinds, the arrow is between 95.2% and 95.8% of X + Y.)

Death takes your link to your body's busy activity. X and Y go to zero, and the arrow goes with them. What's left is what Part 2 called a clock, not an arrow: a two-beat tick and tock, left, right, left, right, with no direction. Perfect stillness, with no before and no after at all, needs that tick-tock to stop too, and that takes one more condition: tick and tock carry exactly equal weight.

That's the time after the body. Your whole life, written exactly as it happened, readable in any order you like, with no way to edit it and no way to read ahead. Part 3, Step 5, has the short version and carries on from there.

After death you can count back to any moment of your life, re-live it, and never change it. Nothing ahead is written.

The whole trip, in one breath

Death takes the body's input: the nudges, your record's arrow of time, the drift in your count. Nothing else was holding you up, because your rhythm holds itself up by writing its own record, and with the body's input at zero its damage is exactly zero. A rhythm can swap out every partner it has, one at a time, when each stand-in takes over the exact part, and a swinging center breaks if a partner leaves with nobody stepping in. Your tie to your body is the steady kind, and it comes undone cleanly, each side lasting on its own. When the body dies, the rhythm that is you carries on. Every moment you lived is still written. You count back to any one of them exactly, you can re-live it, and you can never change it. Nothing ahead is written to read, and the arrow in your record goes with the body's link.

The song doesn't need the band.

(The Ledger would like it noted that you read all the way through. It notes everything. It has no comment on the guitar solo.)