The Odds You’re Living in a Simulation are close to 100%.

Not me saying it, Nobel Prize was awarded for this

Photo by Alejandro E. Rodriguez-Sanchez on Unsplash

The odds you’re living in a simulation are close to 100%.

Not as a metaphor.

As a mathematical conclusion supported by Nobel Prize winning physics.

Start with two assumptions everyone makes

The first one is locality.

Things only affect things near them. Your coffee cools because the air around it is cold. Not because of something happening in Tokyo. Not because of something that happened yesterday. Physical proximity is required for anything to influence anything else.

The second one is realism.

Objects exist whether you’re looking at them or not. The moon is up there right now. The chair exists when you leave the room. Reality is continuous, objective, permanent. It’s out there waiting to be discovered.

Both assumptions feel so obvious that explaining them feels strange.

Both are wrong.

The experiment that broke physics

Thomas Young fires light at a barrier with two slits cut into it.

If light is particles you get two bands on the screen behind it. Simple.

If light is a wave you get something different. Waves spread and overlap and interfere with each other. You get alternating stripes of light and dark across the entire screen.

Young got the stripes. Light is a wave. Newton was wrong. Physics moved on.

Then Einstein proved light also comes in individual particles called photons. Both experiments were rigorous. Both were real.

Light was somehow both at once.

Then it got stranger.

The part that broke Einstein

If light is individual particles, what happens when you fire them one at a time through the two slits?

No beam. No group. One particle. Then pause. Then another.

Nothing to interfere with itself. You’d expect two clean bands.

Physicists ran the experiment in 1986.

The interference pattern appeared anyway.

Each individual particle was somehow passing through both slits simultaneously and interfering with itself.

The particle didn’t have a single definite location. It existed as a wave of probability — potentially here, potentially there — until something forced it to commit to one specific place.

So physicists added a detector. Just to watch which slit each particle actually went through.

The moment they turned the detector on, the interference pattern vanished completely.

Two clean bands. No stripes.

The particles knew they were being watched and acted differently.

Turn the detector off — interference pattern comes back. Turn it on — disappears again.

Replicated thousands of times. Same result every time.

Then it got actually insane

Physicist John Wheeler asked a simple question in the 1970s.

What if you don’t decide whether to turn the detector on until after the particle has already passed through the slits?

The particle has already made its journey. It already went through the barrier. Whatever it did, wave or particle, it already did it.

Now after the fact you decide whether you were watching or not.

Does it matter?

In 2007 physicists ran the experiment.

When they turned the detector on after the particle had already passed through — it retroactively behaved like a particle going through one slit.

When they chose not to observe — it retroactively behaved like a wave going through both.

A decision made after the fact changed what the particle had done before the fact.

The present reached back in time and rewrote the past.

Einstein’s last stand

Einstein spent the final 30 years of his life insisting there had to be a hidden explanation.

His argument: two entangled particles whose properties are linked no matter how far apart they are must either carry hidden predetermined instructions from the start, or measuring one sends information to the other faster than light.

The first option meant quantum mechanics was incomplete. The second violated his own theory of special relativity.

There had to be hidden variables. Reality had to be locally real.

In 1964 physicist John Bell figured out how to test this mathematically. He calculated exactly how correlated two entangled particles could be if hidden variables existed. A hard statistical ceiling.

If experiments found correlations above that ceiling — hidden variables were dead. Einstein was wrong.

John Clauser ran the first test in 1972. The ceiling was violated. Correlations were too strong for hidden instructions to explain.

Alain Aspect closed every remaining loophole in the 1980s. Switched measurement settings after particles had already left their source. Too fast for any pre-written instructions to account for it.

Bell inequality violated again.

Anton Zeilinger used light from stars hundreds of light years away to set experiment parameters. If some hidden conspiracy was faking entanglement it would have needed to be set in motion centuries before anyone designed the test. Before Einstein was born.

Still violated.

In October 2022 Aspect, Clauser, and Zeilinger won the Nobel Prize in Physics.

The official conclusion: the universe is not locally real.

What that actually means

Entangled particles on opposite ends of the universe aren’t two separate things communicating faster than light.

They’re one system.

Distance between them is an illusion.

Nothing has a definite state until something forces it to be definite.

The past doesn’t fully exist until the present requires it to.

Why game development explains all of this

When you build a game world you face a fundamental choice.

Do objects exist permanently, fully rendered, tracked constantly whether or not any player is near them?

Or do you only render what’s actually being observed in that moment?

Every serious game engine picks the second option.

Full permanent object states for an entire world simultaneously would melt any computer ever built. The processing cost is incomprehensible.

So instead objects outside the player’s view exist only as probability. Data waiting to be processed. The moment the player needs to see something the system runs the math and the object becomes real.

And distance in a game engine is an illusion. Two objects on opposite sides of the world aren’t actually separate. They’re data structures sitting next to each other in memory being processed by the same chips.

The universe works identically.

Objects don’t exist until observed. Distance is an illusion. Nothing is definite until the system needs it rendered. The past resolves backward from the present.

Those aren’t properties of a physical universe sitting out there waiting to be discovered.

Those are properties of a simulation running only the computations it needs moment to moment.

The math that seals it

Oxford philosopher Nick Bostrom laid out the logic in 2003.

Computing power doubles roughly every two years. If that trend continues even slightly, future civilizations will eventually be capable of running complete simulations of entire worlds with conscious inhabitants who mistake it for base reality.

If that’s possible, one of three things must be true.

Every civilization destroys itself before reaching that capability.

Every civilization that reaches it chooses never to run simulations.

Or we’re almost certainly already living in one.

If even one civilization survives and runs simulations, they’ll run many. Inside those simulations the inhabitants build more simulations. Simulations all the way down.

The probability that any conscious mind exists in the one base reality out of all possible places approaches zero.

Bostrom calculated this before the Nobel Prize proved the universe operates computationally exactly like a simulation would require.

Pure probability first. Then physics confirmed the structure.

Where this leaves everything

Either something built this simulation operating at a level completely beyond our comprehension.

Or the universe is so fundamentally computational that the distinction between simulation and reality just disappears.

At the base layer reality isn’t matter and energy.

It’s mathematics. Calculation. Information processing.

The universe we were taught to believe in never existed.

What’s actually here renders on demand. Treats distance as an illusion. Keeps nothing definite until the system needs it. Resolves the past backward from the present.

Before Einstein, the atomic age would have looked like magic.

The question now is what currently looks like magic that won’t in a hundred years.

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