This year marks the 20th anniversary of the release of the groundbreaking film, The Matrix. The movie was influential in many ways – the incredible special effects, the no holds barred action, etc., but like some movies before it, it has gone on to become a cultural phenomenon because of its philosophy. The Matrix is perhaps the most popular incarnation of what we now call “the simulation hypothesis” – which is the idea that we are all living in a giant shared online video game.
On this important anniversary, I am releasing my book, The Simulation Hypothesis: An MIT Computer Scientist Shows Why AI, Quantum Physics, and Eastern Mystics All Agree We Are In a Video Game. In this article, I’ll review some of the scientific reasons why this may be the case.
From Science Fiction to Science
Admittedly, the idea sounds like science fiction. The creators of the Matrix, the Wachowskis, claimed to have been influenced by the work of Philip K. Dick, among others. The many adaptations of Dick’s work are well known, including Blade Runner, Total Recall, the Man in the High Castle, the Adjustment Bureau. In his stories, Dick was often obsessed with what was real and what was fake about reality and about the human experience – dealing with issues of artificial intelligence, simulated reality and fake memories.
The Matrix, you’ll recall, starred Keanu Reeves as Neo, a hacker who encounters enigmatic references to something called the Matrix online. This leads him to the mysterious Morpheus (played by Laurence Fishburne, and aptly named after the Greek god of dreams) and his team.
Even if you haven’t seen The Matrix, you’ve probably heard of what happens next, perhaps its most iconic scene, Morpheus gives Neo a choice: take the “red pill” to wake up and see what the Matrix really is, or take the “blue pill” and keep living his life. Neo takes the red pill and “wakes up” in the real world to find that what he thought was real was actually an intricately constructed computer simulation – basically an ultra-realistic video game!
When the Matrix came out, the idea of living in a video game was squarely in the realm of science fiction. Today, the simulation hypothesis is debated seriously by computer scientists, philosophers, physicists and others. The reason this argument is taken more seriously now is two-fold:
1) philosophical “simulation” argument, put forward by Oxford’s Nick Bostrom, and
2) the rapid development of video games, put forth by, among others, Elon Musk.
Two Major Developments
The first was when Oxford professor Nick Bostrom published his 2003 paper, “Are You Living in a Simulation?” Bostrom didn’t say much about video games; instead he made a clever statistical argument. Bostrom theorized that if a civilization ever got the Simulation Point, it would create many ancestor simulations, each with large numbers (billions or trillions?) of simulated beings. Since the number of simulated beings would vastly outnumber the number of real beings, any beings (including us!) were more likely to be living inside a simulation than outside of it! Other scientists, including physicists have taken up this argument.
In the video game version of this argument, we have the rapid advancement of graphics technology. Elon Musk, speaking at the Code Conference in 2016, asserted that 40 years ago, we had pong, which was essentially two lines and a dot. Today we have VR and AR and MMORPGs – all based on 3D technology. If the pace of video game development continues, in a few decades we would have hyper-realistic games, indistinguishable from reality.
And It’s much easier to see a path from today’s VR to something like The Matrix than it was in 1999 when the movie was released. With games like Fortnite and League of Legends having millions of online players interacting in a shared online world, the idea that we might actually be in a shared connected simulated world doesn’t seem so far-fetched.
1. Pixels, Resolution, Virtual and Augmented Reality
Today we are already seeing with Virtual Reality that “full immersion” is possible. Anyone who has played a convincing VR game will realize that it’s possible to forget about the real world and “believe” the world you are seeing is real.
As a great example, I was playing a prototype of a Ping Pong VR game last year (built by Free Range Games), and even though it wasn’t realistic resolution, I lost myself and thought I was playing ping pong for real. So much so that I set the paddle on the ping pong “table” and leaned against the table. Of course, it was a VR table so it didn’t really exist — I ended up dropping the paddle (actually the Vive controller) onto the floor. As I leaned into the “table” I almost fell over before realizing that there was no table. In other words, to quote from The Matrix, there is no spoon.
2. Pixels, Quanta, and Xeno’s Paradox
I recall late nights at MIT during my undergrad years where I had philosophical debates with my classmates about the nature of reality. This was the first time I’d heard of Zeno’s paradox, who presented it in terms of Achilles and a Tortoise. If Achilles was behind the tortoise, and he always had to make up half the distance, how could he ever get there?
Lurking underneath this paradox is the question of whether space is quantized or if it is continuous. The idea was that if space was continuous, like numbers are (you can always find an infinite number of numbers in between any two numbers), how is it possible to touch an object such as the wall? You would always have to cover half the distance and neve get there.
This was my first hint that space might be quantized.
Today’s physicists generally acknowledge Planck constant as being the smallest amount of space that anything can be measure. Moreover, physicists tell us that most of what we think of as a solid object is actually 99% empty space, especially if you look inside the atom. The quanta in quantum physics consists of discrete quantities – of energies or “states” that a particle can exist in. Newton’s equations assumed a continuous amount of space; it turns out the universe may be more quantized than we thought.
3. The Collapse of the Probability Wave, Quantum Indeterminacy
In Quantum physics one of the most intriguing ideas is the probability matrix, which is an interpretation of how subatomic particles can exhibit properties of both a wave and a solid particle at the same time. At the level of an electron or a photon, the wave is interpreted as a set of probabilities of where the particle might be at any given time. When we observe a particular possibility, then the probability wave is said to “collapse” and we see a single particle in a particular location. This is called Quantum Indeterminacy.
How does the probability wave collapse? This is one of the biggest mysteries in physics. The best answer physicists have come up with is that consciousness somehow determines the collapse. Max Planck once wrote, “I consider consciousness as fundamental and matter as derivative”.
An even bigger mystery is why does the universe work this way?
The simulation hypothesis provides a pretty good answer. The reason that video games have advanced so far in a few decades is because of optimization techniques. It would be impossible even for today’s computers to render in real time all the pixels of a single 3D world – instead, information is stored as 3D models outside the rendered world and then only what a particular character can see from a certain angle is rendered. In short, only that which is being observed is rendered. Many adherents of the simulation hypothesis think that quantum indeterminacy is an optimization technique with the same basic idea: only render that which is being observed.
4. Future Selves, and Parallel Universes
Another related aspect of Quantum Physics that sounds like science fiction is the Parallel Universes theory, where we branch into different “universes” when we make decisions. If that’s true, then there is a directed graph of multiple universes that are branching out each time we make a decision, resulting in different timelines (in fact, the parallel universes theory was put forward to solve the grandfather paradox of time travel).
Physicist Fred Alan Wolf, for example, says that information from these possible futures is coming to us in the present and that we send out an “offer wave” into the future, which is interacting with the “offer waves” coming from the future to the present. Which possible future we navigate to depends on which choices we make, and how these two waves super-pose on each other (or cancel each other out).
These are startling results. Future probable selves are sending back information to the present, and we are consciously choosing which path to follow.
This reminded me of the very first video game I made back at MIT. The way that the computer chose the next move was to project the possible futures, and then use a certain algorithm to “rank” those futures, and then bring those values back to the present and then the AI would choose the path to follow.
Did the possible futures we were calculating in our game actually exist? Or were they just probabilities? I realized that this isn’t too much different from what’s happening at the quantum level, except that in existing games like chess or checkers, we use a simple function (based on the rules of the game) to decide which of the paths is most optimal. We used the “minimax” algorithm in game design, trying to maximize our score and minimize our opponents score at each “turn of the future”.
5. The Speed of light
Another big mystery is why the speed of light is one of the few constants, one of the few fundamental values in physics. In fact, all matter has been equated with energy, and energy may be a derivative of light itself. While other things change, including gravity and space-time, Einstein found that the speed of light remains fixed.
Why would the speed of electromagnetic waves be the same speed at which information can travel through the universe?
In video games, it turns out that pixels are based on light – they are illuminated for a temporary period, and all communication happens between computers at the speed of light. Just as in relativity where simultaneity cannot really be guaranteed, the same is true video games – each player is working off of his computer and responding to information about the game, which is being sent to cloud servers outside the rendered world. The cloud serve is doing its best to respect simultaneity and order the events, but it may actually be impossible.
Along with the statistical simulation argument and the advance in video game technology, these are some of the reasons why scientists are starting to take the simulation hypothesis seriously. In fact, many physicists and biologists are starting to realize that underneath the physical objects they are studying, the universe is actually information. Famous physicist John Wheeler in his autobiography wrote “it from bit” – meaning that bits, not matter, are the fundamental “thing in the universe”.
This would not only be consistent with a video game simulation like that in The Matrix, it would explain some of the big unanswered questions in science – why does it work this way? While we aren’t able to duplicate The Matrix at this stage of our technology, our computer science and video games have gotten far enough along that we are well on the road to being able to duplicate it ourselves!
WORDS: Rizwan Virk
IMAGE SOURCE: Creative Commons; Screenshots
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