Wrestling with Time: Untangling Reality, One Paradox at a Time

The clocks on GPS satellites have to be corrected by about thirty-eight microseconds every single day, or else our navigation would drift by miles. Just to account for the fact that time literally moves at a different speed for them in orbit than it does for us down here. Exactly. And it throws everything into question. Last week we were wrestling with free will, with this idea that the future is an open field of possibilities we get to choose from. But that whole idea rests on an assumption about what time is. That it’s a river, right? That it flows from the past, through this one special moment called "now," and into an unwritten future.

But what if it isn't? What if that feeling of flow is just… a feature of our minds, not the universe? Some physicists and philosophers argue that time isn't fundamental at all. That it's an emergent property, maybe even an illusion. Okay, so what does that even mean, for time to not be real? I am experiencing it right now. I remember breakfast this morning, and I'm anticipating dinner tonight. That feels about as real as it gets. I know. The subjective experience is undeniable. But the argument goes something like this: The laws of physics, at their most fundamental level, don't really distinguish between past, present, and future.

They're time-symmetric. So the "arrow of time," the reason we remember the past and not the future… that's the real mystery. So why does the egg break but not un-break? Why do we get older and not younger? The best guess is entropy. The universe is moving from a state of order to disorder. That process gives time a direction. But it doesn't necessarily mean that the "present" is special. This leads to two completely different ways of seeing reality. One is called presentism. Which says… what I think it says? Only the present moment is real. Right. The past is gone, the future doesn't exist yet. It's intuitive.

It's how we feel. But the other view, which fits a little more cleanly with relativity, is called eternalism. Eternalism. Okay. Eternalism says that the past, the present, and the future are all equally real. That reality is a four-dimensional block—the "block universe"—and time is just one of those dimensions, like length or width. All moments exist simultaneously. Wait. So… the moment Caesar crossed the Rubicon and the moment I decide what to say next… they’re both just… there? Equally real? According to the eternalist view, yes. We are just traveling through that block, and our consciousness illuminates one "slice" of it at a time, creating the illusion of a moving present.

That's… deeply unsettling. Because if the future is already there, just as real as the past… then what happens to choice? There's the connection. If the block universe is real, then our conversation right now, every word we're about to say… it's already part of the structure. Our feeling of choosing is just us experiencing a pre-existing event. So our whole discussion last week about free will would be moot. It was always going to happen this way. It's just a movie we're watching from the inside. It feels that way. But then, why does the subjective feeling of passage and choice feel so powerful? So central to being human?

Maybe physics describes the what, but it can't describe the how it feels. Or maybe our perception isn't an illusion, but another piece of the puzzle. Maybe our consciousness isn't just a passenger in time, but somehow participates in the creation of it. I think that's the gap we're left in. This chasm between the world as described by physics—static, determined, a block of spacetime—and the world we actually live in, which feels dynamic and open and full of consequence. We can't seem to reconcile the two. And maybe we don't have to. Maybe the point isn't to pick one and discard the other. Maybe reality is just that strange, that it can be both things at once.

A fixed map, but a journey that feels brand new every step of the way. So we’re back where we started, in a way. Staring at the clock, knowing it’s both a profound truth and, possibly, a profound illusion. And we’re stuck right in the middle of it.