The other answer has already been accepted but there's a similar slightly older story with the same theme that the description reminded me of:
One day, the stars in the night sky begin to change.
Some grow brighter. Some grow dimmer. Most remain the same.
Astronomical telescopes capture it all, moment by moment. The stars
that change, change their luminosity one at a time, distinctly so; the
luminosity change occurs over the course of a microsecond, but a whole
second separates each change.
It is clear, from the first instant anyone realizes that more than one
star is changing, that the process seems to center around Earth
particularly. The arrival of the light from the events, at many stars
scattered around the galaxy, has been precisely timed to Earth in its
orbit. Soon, confirmation comes in from high-orbiting telescopes
(they have those) that the astronomical miracles do not seem as
synchronized from outside Earth. Only Earth's telescopes see one star
changing every second (1005 milliseconds, actually).
Almost the entire combined brainpower of Earth turns to analysis.
It quickly becomes clear that the stars that jump in luminosity, all
jump by a factor of exactly 256; those that diminish in luminosity,
diminish by a factor of exactly 256. There is no apparent pattern in
the stellar coordinates. This leaves, simply, a pattern of
"A binary message!" is everyone's first thought.
But in this world there are careful thinkers, of great prestige as
well, and they are not so sure. "There are easier ways to send a
message," they post to their blogs, "if you can make stars flicker,
and if you want to communicate. Something is happening. It appears,
prima facie, to focus on Earth in particular. To call it a 'message'
presumes a great deal more about the cause behind it. There might be
some kind of evolutionary process among, um, things that can make
stars flicker, that ends up sensitive to intelligence somehow...
Yeah, there's probably something like 'intelligence' behind it, but
try to appreciate how wide a range of possibilities that really
implies. We don't know this is a message, or that it was sent from
the same kind of motivations that might move us. I mean, we would
just signal using a big flashlight, we wouldn't mess up a whole
By this time, someone has started to collate the astronomical data and
post it to the Internet. Early suggestions that the data might be
harmful, have been... not ignored, but not obeyed, either. If
anything this powerful wants to hurt you, you're pretty much dead
Multiple research groups are looking for patterns in the stellar
coordinates—or fractional arrival times of the changes, relative to
the center of the Earth—or exact durations of the luminosity shift—or
any tiny variance in the magnitude shift—or any other fact that might
be known about the stars before they changed. But most people are
turning their attention to the pattern of BRIGHTS and dims.
It becomes clear almost instantly that the pattern sent is highly
redundant. Of the first 16 bits, 12 are BRIGHTS and 4 are dims. The
first 32 bits received align with the second 32 bits received, with
only 7 out of 32 bits different, and then the next 32 bits received
have only 9 out of 32 bits different from the second (and 4 of them
are bits that changed before). From the first 96 bits, then, it
becomes clear that this pattern is not an optimal, compressed encoding
of anything. The obvious thought is that the sequence is meant to
convey instructions for decoding a compressed message to follow...
"But," say the careful thinkers, "anyone who cared about efficiency,
with enough power to mess with stars, could maybe have just signaled
us with a big flashlight, and sent us a DVD?"
There also seems to be structure within the 32-bit groups; some 8-bit
subgroups occur with higher frequency than others, and this structure
only appears along the natural alignments (32 = 8 + 8 + 8 + 8).
After the first five hours at one bit per second, an additional
redundancy becomes clear: The message has started approximately
repeating itself at the 16,385th bit.
Breaking up the message into groups of 32, there are 7 bits of
difference between the 1st group and the 2nd group, and 6 bits of
difference between the 1st group and the 513th group.
"A 2D picture!" everyone thinks. "And the four 8-bit groups are
colors; they're tetrachromats!"
But it soon becomes clear that there is a horizontal/vertical
asymmetry: Fewer bits change, on average, between (N, N+1) versus (N,
N+512). Which you wouldn't expect if the message was a 2D picture
projected onto a symmetrical grid. Then you would expect the average
bitwise distance between two 32-bit groups to go as the 2-norm of the
grid separation: √(h2 + v2).
There also forms a general consensus that a certain binary encoding
from 8-groups onto integers between -64 and 191—not the binary
encoding that seems obvious to us, but still highly regular—minimizes
the average distance between neighboring cells. This continues to be
borne out by incoming bits.
The statisticians and cryptographers and physicists and computer
scientists go to work. There is structure here; it needs only to be
unraveled. The masters of causality search for conditional
independence, screening-off and Markov neighborhoods, among bits and
groups of bits. The so-called "color" appears to play a role in
neighborhoods and screening, so it's not just the equivalent of
surface reflectivity. People search for simple equations, simple
cellular automata, simple decision trees, that can predict or compress
the message. Physicists invent entire new theories of physics that
might describe universes projected onto the grid—for it seems quite
plausible that a message such as this is being sent from beyond the
After receiving 32 * 512 * 256 = 4,194,304 bits, around one and a half
months, the stars stop flickering.
Theoretical work continues. Physicists and cryptographers roll up
their sleeves and seriously go to work. They have cracked problems
with far less data than this. Physicists have tested entire
theory-edifices with small differences of particle mass;
cryptographers have unraveled shorter messages deliberately obscured.
Two dominant models have survived, in academia, in the scrutiny of the
public eye, and in the scrutiny of those scientists who once did
Einstein-like work. There is a theory that the grid is a projection
from objects in a 5-dimensional space, with an asymmetry between 3 and
2 of the spatial dimensions. There is also a theory that the grid is
meant to encode a cellular automaton—arguably, the grid has several
fortunate properties for such. Codes have been devised that give
interesting behaviors; but so far, running the corresponding automata
on the largest available computers, has failed to produce any
decodable result. The run continues.
Every now and then, someone takes a group of especially brilliant
young students who've never looked at the detailed binary sequence.
These students are then shown only the first 32 rows (of 512 columns
each), to see if they can form new models, and how well those new
models do at predicting the next 224. Both the 3+2 dimensional model,
and the cellular-automaton model, have been well duplicated by such
students; they have yet to do better. There are complex models finely
fit to the whole sequence—but those, everyone knows, are probably
Ten years later, the stars begin flickering again.
Within the reception of the first 128 bits, it becomes clear that the
Second Grid can fit to small motions in the inferred 3+2 dimensional
space, but does not look anything like the successor state of any of
the dominant cellular automaton theories. Much rejoicing follows, and
the physicists go to work on inducing what kind of dynamical physics
might govern the objects seen in the 3+2 dimensional space. Much work
along these lines has already been done, just by speculating on what
type of balanced forces might give rise to the objects in the First
Grid, if those objects were static—but now it seems not all the
objects are static. As most physicists guessed—statically balanced
theories seemed contrived.
Many neat equations are formulated to describe the dynamical objects
in the 3+2 dimensional space being projected onto the First and Second
Grids. Some equations are more elegant than others; some are more
precisely predictive (in retrospect, alas) of the Second Grid. One
group of brilliant physicists, who carefully isolated themselves and
looked only at the first 32 rows of the Second Grid, produces
equations that seem elegant to them—and the equations also do well on
predicting the next 224 rows. This becomes the dominant guess.
But these equations are underspecified; they don't seem to be enough
to make a universe. A small cottage industry arises in trying to
guess what kind of laws might complete the ones thus guessed.
When the Third Grid arrives, ten years after the Second Grid, it
provides information about second derivatives, forcing a major
modification of the "incomplete but good" theory. But the theory
doesn't do too badly out of it, all things considered.
The Fourth Grid doesn't add much to the picture. Third derivatives
don't seem important to the 3+2 physics inferred from the Grids.
The Fifth Grid looks almost exactly like it is expected to look.
And the Sixth Grid, and the Seventh Grid.
(Oh, and every time someone in this world tries to build a really
powerful AI, the computing hardware spontaneously melts. This isn't
really important to the story, but I need to postulate this in order
to have human people sticking around, in the flesh, for seventy
That even Einstein did not come within a million light-years of making
efficient use of sensory data.
Riemann invented his geometries before Einstein had a use for them;
the physics of our universe is not that complicated in an absolute
sense. A Bayesian superintelligence, hooked up to a webcam, would
invent General Relativity as a hypothesis—perhaps not the dominant
hypothesis, compared to Newtonian mechanics, but still a hypothesis
under direct consideration—by the time it had seen the third frame of
a falling apple. It might guess it from the first frame, if it saw
the statics of a bent blade of grass.
We would think of it. Our civilization, that is, given ten years to
analyze each frame. Certainly if the average IQ was 140 and Einsteins
were common, we would.
Even if we were human-level intelligences in a different sort of
physics—minds who had never seen a 3D space projected onto a 2D
grid—we would still think of the 3D->2D hypothesis. Our
mathematicians would still have invented vector spaces, and
Even if we'd never seen an accelerating billiard ball, our
mathematicians would have invented calculus (e.g. for optimization
Heck, think of some of the crazy math that's been invented here on our
I occasionally run into people who say something like, "There's a
theoretical limit on how much you can deduce about the outside world,
given a finite amount of sensory data."
Yes. There is. The theoretical limit is that every time you see 1
additional bit, it cannot be expected to eliminate more than half of
the remaining hypotheses (half the remaining probability mass,
rather). And that a redundant message, cannot convey more information
than the compressed version of itself. Nor can a bit convey any
information about a quantity, with which it has correlation exactly
zero, across the probable worlds you imagine.
But nothing I've depicted this human civilization doing, even begins
to approach the theoretical limits set by the formalism of Solomonoff
induction. It doesn't approach the picture you could get if you could
search through every single computable hypothesis, weighted by their
simplicity, and do Bayesian updates on all of them.
To see the theoretical limit on extractable information, imagine that
you have infinite computing power, and you simulate all possible
universes with simple physics, looking for universes that contain
Earths embedded in them—perhaps inside a simulation—where some process
makes the stars flicker in the order observed. Any bit in the
message—or any order of selection of stars, for that matter—that
contains the tiniest correlation (across all possible computable
universes, weighted by simplicity) to any element of the environment,
gives you information about the environment.
Solomonoff induction, taken literally, would create countably
infinitely many sentient beings, trapped inside the computations. All
possible computable sentient beings, in fact. Which scarcely seems
ethical. So let us be glad this is only a formalism.
But my point is that the "theoretical limit on how much information
you can extract from sensory data" is far above what I have depicted
as the triumph of a civilization of physicists and cryptographers.
It certainly is not anything like a human looking at an apple falling
down, and thinking, "Dur, I wonder why that happened?"
People seem to make a leap from "This is 'bounded'" to "The bound must
be a reasonable-looking quantity on the scale I'm used to." The power
output of a supernova is 'bounded', but I wouldn't advise trying to
shield yourself from one with a flame-retardant Nomex jumpsuit.
No one—not even a Bayesian superintelligence—will ever come remotely
close to making efficient use of their sensory information...
...is what I would like to say, but I don't trust my ability to set
limits on the abilities of Bayesian superintelligences.
(Though I'd bet money on it, if there were some way to judge the bet.
Just not at very extreme odds.)
The story continues:
Millennia later, frame after frame, it has become clear that some of
the objects in the depiction are extending tentacles to move around
other objects, and carefully configuring other tentacles to make
particular signs. They're trying to teach us to say "rock".
It seems the senders of the message have vastly underestimated our
intelligence. From which we might guess that the aliens themselves
are not all that bright. And these awkward children can shift the
luminosity of our stars? That much power and that much stupidity
seems like a dangerous combination.
Our evolutionary psychologists begin extrapolating possible courses of
evolution that could produce such aliens. A strong case is made for
them having evolved asexually, with occasional exchanges of genetic
material and brain content; this seems like the most plausible route
whereby creatures that stupid could still manage to build a
technological civilization. Their Einsteins may be our undergrads,
but they could still collect enough scientific data to get the job
done eventually, in tens of their millennia perhaps.
The inferred physics of the 3+2 universe is not fully known, at this
point; but it seems sure to allow for computers far more powerful than
our quantum ones. We are reasonably certain that our own universe is
running as a simulation on such a computer. Humanity decides not to
probe for bugs in the simulation; we wouldn't want to shut ourselves
Our evolutionary psychologists begin to guess at the aliens'
psychology, and plan out how we could persuade them to let us out of
the box. It's not difficult in an absolute sense—they aren't very
bright—but we've got to be very careful...
We've got to pretend to be stupid, too; we don't want them to catch on
to their mistake.
It's not until a million years later, though, that they get around to
telling us how to signal back.
At this point, most of the human species is in cryonic suspension, at
liquid helium temperatures, beneath radiation shielding. Every time
we try to build an AI, or a nanotechnological device, it melts down.
So humanity waits, and sleeps. Earth is run by a skeleton crew of
nine supergeniuses. Clones, known to work well together, under the
supervision of certain computer safeguards.
An additional hundred million human beings are born into that skeleton
crew, and age, and enter cryonic suspension, before they get a chance
to slowly begin to implement plans made eons ago...
From the aliens' perspective, it took us thirty of their
minute-equivalents to oh-so-innocently learn about their psychology,
oh-so-carefully persuade them to give us Internet access, followed by
five minutes to innocently discover their network protocols, then some
trivial cracking whose only difficulty was an innocent-looking
disguise. We read a tiny handful of physics papers (bit by slow bit)
from their equivalent of arXiv, learning far more from their
experiments than they had. (Earth's skeleton team spawned an extra
twenty Einsteins, that generation.)
Then we cracked their equivalent of the protein folding problem over a
century or so, and did some simulated engineering in their simulated
physics. We sent messages (steganographically encoded until our
cracked servers decoded it) to labs that did their equivalent of DNA
sequencing and protein synthesis. We found some unsuspecting schmuck,
and gave it a plausible story and the equivalent of a million dollars
of cracked computational monopoly money, and told it to mix together
some vials it got in the mail. Protein-equivalents that
self-assembled into the first-stage nanomachines, that built the
second-stage nanomachines, that built the third-stage nanomachines...
and then we could finally begin to do things at a reasonable speed.
Three of their days, all told, since they began speaking to us. Half
a billion years, for us.
They never suspected a thing. They weren't very smart, you see, even
before taking into account their slower rate of time. Their primitive
equivalents of rationalists went around saying things like, "There's a
bound to how much information you can extract from sensory data." And
they never quite realized what it meant, that we were smarter than
them, and thought faster.