How do you start your day today? Did the alarm jolt you awake, or did you snooze a few extra minutes? Maybe you leapt straight into a workout, hopped into a shower, or grabbed a quick bite before heading to work. There are countless ways you could have begun this morning – literally millions of variations. But could you prove to anyone else that any of those moments actually occurred? Could you demonstrate that you exist, or that anyone else does?
For many, the question sounds absurd. Of course you’re real, and of course the world is real – that’s the default setting we run on. Yet, how can we be sure? How do you truly know anything beyond your own mind? Let’s dig a little deeper and see what we can uncover.
1 What Is Real?
Most of us assume that the sights, sounds, smells, tastes, and tactile sensations we encounter daily constitute reality. In practice, we have to live as if that’s true; societies would collapse if we all doubted our own existence. Yet a collective agreement doesn’t magically create objective truth.
Think about a dream that felt utterly authentic, or a fleeting glimpse from the corner of your eye that vanished when you turned to look. Our senses can be fooled quite easily. Magicians exploit this constantly, crafting illusions that convince us one thing while the truth is another. Even in everyday life, subtle tricks manipulate nearly every sense, leading us to accept false premises as fact.
Consider phantom‑limb syndrome, where amputees continue to feel limbs that no longer exist. Hallucinations, whether visual or auditory, can be induced by certain medications or psychiatric conditions, making imagined experiences indistinguishable from reality. Synesthesia swaps sensory channels, letting people “see” music or “smell” colors. These phenomena illustrate how the brain can generate experiences that feel real even when they have no external counterpart.
Psychiatrists note that many individuals trust their subjective reality over objective evidence, a testament to the power of personal consciousness. If you genuinely believe something, why would you concede that it isn’t true when faced with contradictory external data?
Imagine stepping outside in a blue shirt, only for a passerby to insist you’re wearing gold. You’d likely think they’re delusional, yet they’re staring at you, convinced you’re gold‑clad. This mirrors the viral “dress” debate where some saw white‑and‑gold while others saw blue‑and‑black. Perception, after all, becomes reality for each observer, and you cannot easily dismiss your own visual experience, even when it clashes with others’ reports.
Among the many theories tackling the nature of existence, the simulation hypothesis stands out as a modern contender.
2 The Simulation Hypothesis
How Do You Wonder If It’s All Code?
If someone asked you right now to estimate the odds that we’re living inside a computer‑generated simulation, what number would you throw out? Experts often hover around a 50/50 split. Should our technology ever enable the creation of artificial consciousness, those odds could tip dramatically toward the simulation side. The idea that your entire existence might be a cosmic coin flip can feel unsettling.
Neil de Grasse Tyson has remarked that it’s hard to refute the possibility of a simulated universe. He points to the exponential growth in computing power – from the humble beginnings of early computers to today’s sprawling virtual worlds like Minecraft and The Sims, or sophisticated AI models such as ChatGPT. Imagine the computers of tomorrow, a hundred years from now; they could render realities indistinguishable from our own.
Tyson also posits a mind‑bending recursion: a simulated being could eventually invent the very computer that runs its world, spawning yet another layer of simulation. This cascade could repeat ad infinitum, producing countless nested realities. If that’s the case, the probability that we inhabit the original, “real” universe becomes vanishingly small. In this view, we’re merely programs following an algorithm, granted the illusion of free will because we aren’t programmed to suspect otherwise.
A sobering aspect of the simulation hypothesis is that, with our current scientific toolkit, we have no definitive method to prove or disprove it. The theory remains tantalizingly untestable.
3 I Think Therefore I Am
While the simulation idea is a product of recent decades, the quest to question reality stretches back centuries. René Descartes famously declared, “I think, therefore I am,” anchoring his certainty in the very act of doubting. This statement affirms his own existence, but it also underscores a deeper point: the only thing we can be absolutely sure of is the presence of the thinking self.
Descartes argued that everything external to the self must be subjected to doubt, leaving only the doubter as indisputable. In other words, the “I” that questions must exist, otherwise there would be no entity to perform the doubt.
Even our internal perceptions aren’t immune to deception. Certain mental illnesses or psychoactive substances can convince a person they are, say, Napoleon Bonaparte, despite overwhelming evidence to the contrary. Conversely, perhaps you truly are Napoleon and everyone else is misperceiving. Thus, while “I think, therefore I am” holds, the nature of the “I” remains open to debate.
Descartes ultimately suggested that embracing the reality of the external world is pragmatic—it’s simply easier to function that way. Yet philosophers have since delved deeper, wrestling with the difficulty of proving reality through scientific means. As a philosophical exercise, the problem is fascinating; as a scientific quest, it remains elusive.
4 Scientific Attempts to Prove That Reality Is Real
If you’re not currently spiraling into an existential crisis, you’re probably wondering how scientists try to demonstrate that the world is indeed real. It’s not enough to accept unknowability; researchers have devised clever experiments that sidestep sensory reliance.
One line of inquiry tests quantum mechanical ideas suggesting reality doesn’t solidify until observed. The classic Schrödinger’s cat thought experiment illustrates this: the cat’s fate remains indeterminate until the box is opened. In a real‑world study, scientists showed that regardless of who observes, the underlying reality remains consistent, supporting an objective “real” interpretation.
Another investigation, carried out by Chinese physicists, explored quantum entanglement. Their findings indicated that certain properties of particles don’t crystallize until a measurement is made, implying that reality, in that sense, only emerges when we look for it.
By entangling two distant particles and then measuring them, the researchers observed that the measurable qualities were absent until observation occurred. This reinforces the notion that reality becomes concrete when we engage with it, a step up from the idea that it never exists at all.
Wigner’s Friend, another famed quantum paradox, pits two observers against each other. Inside a lab, “Wigner’s friend” measures a particle and records a definite spin‑up result. Outside, Wigner, lacking direct knowledge, can still mathematically argue that the particle exists in a superposition of spin‑up and spin‑down. Both perspectives are internally consistent, suggesting that reality may be simultaneously subjective and objective, depending on the observer’s frame.
One comforting takeaway amid these mind‑bending experiments is that, simulation or not, life continues to unfold. You’ll likely enjoy countless experiences—meeting new people, savoring diverse cuisines, falling in love, traveling, and navigating both triumphs and setbacks. Even if the universe were a grand simulation, the richness of those experiences remains meaningful to you.