NPC Check: Are You Even Real?
What's the fastest you've ever gone? Highway speeds? That steep drop moment on a roller coaster?
No matter how fast you push it, there's a cosmic speed limit waiting. Nothing can outrun light. 299,792 km/s. Full stop.
Physics draws this hard line like a setting in some cosmic operating system. And there are more. Space gets grainy when you zoom in far enough. Energy comes in discrete chunks rather than flowing smoothly.
For a universe that's supposed to be infinite and seamless, these feel suspiciously like frame rates and resolution limits.
Almost like reality is running on hardware.
The Question That Keeps Philosophers Awake
What if our reality operates on rules that look a lot like code? The setup goes like this: you're a conscious observer. But are you an "original" in base reality, or a "copy" living inside a simulation, completely convinced your world is real?
Am I real or am I a copy? To answer this you’d use probability as your tool.
Think of it like a seesaw. Originals on one side, copies on the other. Add enough copies, and the balance tips over.
There are four dials that control how many copies get made:
- Survival: How many civilizations survive their dangerous teenage years?
- Willingness: How many choose to run detailed simulations of worlds like ours?
- Scale: How many worlds does each civilization create?
- Population: How many conscious beings live in each world?
Earth's weight on the "originals" side is about 117 billion humans who've ever lived. When those four dials multiply to hit that number, you reach the tipping point. Cross it, and copies outnumber originals.
Three Doors of Possibilities
Philosopher Nick Bostrom mapped out three possibilities based on the dials above:
Door 1: Most civilizations die young. Originals win. Your odds of being real? Good. Our species' long-term prospects? Grim.
Door 2: Civilizations survive but choose restraint. They regulate simulations like nuclear research. Your odds? 50/50.
Door 3: Civilizations survive and simulation becomes routine. Copies multiply like browser tabs. Your odds of being real? Nearly zero.
Now, the unsettling part, even if only one in ten civilizations survives, and only one in ten of those runs simulations, you only need about a hundred Earth-scale worlds per civilization to flip the balance.
That's it. A hundred simulated worlds, and the math says you're probably an NPC.
Bostrom spelled it out in 2003 (full paper here) with a simple formula:
Where:
- = total number of simulated humans
- = fraction of civilizations that survive and choose to run simulations
- = average number of simulations per such civilization
- = average number of individuals who lived in a civilization before it reached posthuman stage
- = total number of humans who have ever lived in base reality
If N_sim grows much bigger than N_real, the scales tip. In that world, almost every mind like yours belongs to someone in a simulation, not the original.
Why This Matters
This forces you to bet on humanity's future. Do you think we'll survive climate change, AI, nuclear weapons? If we do, will we use that power responsibly?
Your gut-answers quietly set those dials whether you realize it or not.
There's a smaller lesson here. We all live within limits we didn't choose. The question stops from being about whether these limits are "real" or "simulated." The question becomes: which dials can you actually move?
How you spend attention. Who you choose to love. What work gets your best hours. Whether you scroll or read. Whether you add noise or signal to the world.
These are your dials. Unlike the cosmic ones, you can reach them.
Booting Up Your Day
Maybe this is base reality. Maybe it's level seven of someone else's simulation. Either way, you'll wake up tomorrow. Make coffee. Decide how much of your life to give away to other people's emergencies and how much to keep for what matters.