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You can only perceive three dimensions, but there may be up to nine more hidden all around you, and we're going to explain every single one, starting with the simplest thing that can exist, a single point. In the zeroth dimension,
Explore all nine dimensions from a point to alternate realities and beyond in this concise 9-minute explanation.
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Key Takeaways
- Humans perceive only three spatial dimensions, but higher dimensions may exist beyond our senses.
- Time is considered the fourth dimension, extending life as a continuous shape.
- Higher dimensions involve branching realities and alternate universes with different outcomes and laws.
- Each higher dimension contains what would seem godlike to beings in the lower dimensions.
- Understanding dimensions beyond three challenges our perception of reality and existence.
What the video covers
- The video explains dimensions from zero to nine, starting with a point that has no size or direction.
- The first dimension is a line with only forward and backward movement.
- The second dimension adds width, creating a flat world like Flatland, where height doesn't exist.
- The third dimension is our familiar world with depth, allowing movement around objects.
- The fourth dimension is time, seen as a direction extending life from birth to death as a single object.
- The fifth dimension introduces branching timelines representing all possible choices and alternate lives.
- The sixth dimension allows movement between these alternate timelines within the same universe.
- The seventh dimension contains all possible universes with different starting points and histories.
- The eighth dimension is a plane of infinite universes with every possible beginning stacked together.
- The ninth dimension changes the fundamental laws of reality, encompassing every possible universe and set of rules.
Chapters
- 00:00Introduction and Zeroth Dimension
- 00:33First Dimension: The Line
- 01:09Second Dimension: Flatland
- 01:44Perception in Flatland
- 02:14Third Dimension: Our World
- 02:51Limits of Human Perception
- 03:24Fourth Dimension: Time
- 03:58Life as a Four-Dimensional Object
- 04:29Fifth Dimension: Branching Timelines
- 05:02Sixth Dimension: Moving Between Timelines
Full Transcript — Download SRT & Markdown
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you are a single dot in space, a creature with no length, width, or height. If you somehow existed as a zero-dimensional being, you wouldn't be tiny. You would have no size at all.
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There would be no left, no right, no up, no forward. There wouldn't even be a second location for anything else to exist. But stretch that point in a single direction, and it becomes a line.
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This takes us from the zeroth to the first dimension. Imagine a train on an infinitely long track, stretching forever in both directions. Forward and backward are the only ways it can move.
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There are no turns to take, no alternate routes, no way to leave the rails. As far as the train is concerned, the track is not part of the universe. The track is the universe. Now imagine that was you. Endless space ahead of you and
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behind you, but an entire world sitting just inches away that you could never reach. Not because something is blocking you, but because that direction simply does not exist in your reality. But take that infinitely long track and sweep it
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sideways, then you unlock the second dimension. Welcome to Flatland, a name taken from an 1884 novella by Edwin Abbott that imagined exactly this kind of world, a universe with length and width, but no height. Picture a drawing on a sheet of paper that's somehow come
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alive. It can move anywhere across the page, but it can never leave it because up is not a direction it can perceive.
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Now imagine holding your hand just an inch above that paper. The creature living on it has no idea you exist. It cannot look up and discover you because for it, there is no up. And this is where things become strange. Lower a
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finger and touch the page. From the creature's point of view, a circle has just appeared out of nowhere. To a flat being, you are a god. You can look inside sealed rooms from above. You can pick it up and place it somewhere else.
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To everyone in Flatland, it would appear to vanish into thin air and reappear across the world. You're the god in this story, but hold on to how that feels because in a few minutes, we are going to be the flat creature. Take this plane
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and lift it into height and you finally arrive somewhere that feels familiar, the third dimension.
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This is you right now, living in a world of depth, a world where you can walk around an object and see its hidden sides, judge how far away something is before you touch it, and reach through space to interact with things around
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you. It feels complete, but Flatland felt complete, too. Its inhabitants could move left and right across their universe and never once suspect an entire direction existed beyond it. Not because they were stupid, but because they had no way to perceive it. And that
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is the uncomfortable part. The only reason three dimensions feel like the whole story is that every sense you possess was built to operate inside them. If another direction exists beyond this one, your brain may be no more capable of perceiving it than a
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Flatlander is capable of looking up. Don't just take my word for it. Try this right now. Hold one hand out in front of you. Now move it left. Move it right.
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Move it up. Move it down. Move it toward you. Move it away from you. Now try to move your hand in a completely new direction. Not diagonally. Not a combination of the others. A genuinely new direction. That feeling of being
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stuck inside three dimensions is exactly what a Flatlander experiences when you ask it to move up. But, the next dimension is not a direction you can point at. It is one you have been traveling through your entire life. That
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fourth dimension is time. We don't usually think of time as a dimension, but that's exactly what it is, a direction that reality extends in just like length or width. If you think you're just a 3D body, you're very
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wrong. Stretched out across the fourth dimension, you are an immense snaking object that runs all the way from the instant you were born to the instant you die. The crawling baby, the kid on the bike, the person watching this right
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now, the old face you haven't grown into yet. Every one of them is part of the same unbroken shape. A being who could see in four dimensions would look at you the way you look at a marble statue.
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Your entire life, birth to death, taken in at a single glance as one frozen object. You have never seen your own true shape and you never will. But here's the unsettling part. That means your whole life, every moment you think
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hasn't happened yet, in a sense, already exists. You're just experiencing the finished sculpture one frame at a time.
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Your future self is as solid and real as the hand in front of your face. You just haven't slid far enough along the statue to reach them yet. But that sculpture only contains the choices you actually made. Let the path itself split and you
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fall into the fifth dimension. The job you turned down, the text you almost didn't send, the night you almost stayed in instead of going out and missed the person who would have changed everything. Every one of those was a
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fork, a point where your life could have gone another way. And in the fifth dimension, every one of those other ways is real. In the fourth dimension, your life is a single thread running from birth to death. In the fifth, that
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thread branches. Every choice you could have made, every chance event that could have gone differently, splits off into its own separate path. Somewhere in the fifth dimension is a version of you living a life so different they'd barely
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recognize the one you're in now, which raises an irresistible question. If all those paths sit side by side, what happens when you can move between them?
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That's the sixth dimension. You step off your own timeline and walk into any other branch you could have lived, treating that entire web of paths as a single space you're free to roam.
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Picture a vast landscape with every road you might have taken stretching off in every direction and you moving through it at will. Out of the life where you became a musician and into the one where you never touched an instrument. Out of
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the life where everything worked out and into the one where it all came apart, then back again whenever you like. But wander as far as you want and every road still traces back to the same starting point, the same birth, the same universe
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you opened your eyes in. That's the one thing you can't change here. The seventh dimension changes the beginning itself.
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This is where we stop talking about your life and start talking about every life that could ever be. The seventh dimension contains all possible histories that begin from completely different starting points. A version of you born to different parents on a
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different Earth, a universe where the Big Bang expanded a little faster, cooled a little slower, or scattered its matter so differently that galaxies formed where ours has empty space. Each of those beginnings generates its own infinite web of timelines and
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possibilities, and the seventh dimension contains all of them at once, which leads to a strange consequence. A single point in this dimension is no longer a moment, a life, or even a universe. It is an entire infinity of universes
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sharing the same origin. And if one point can contain an infinity of universes, nothing stops us from placing those points side by side. This gives us the eighth dimension, a whole plane built out of those infinities, every possible history of every possible
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universe with every possible beginning stacked together like pages in a book with no last page. We have now sprinted so far past anything human senses were ever built to handle that no single picture fully survives the trip. If the
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seventh dimension was a single library containing every book that could ever be written, the eighth is every lib...
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forever and never land on the same reality twice. And yet, here's the strange part. For all that monstrous unthinkable vastness, every universe we've stacked up so far is still quietly obeying the same rule book. Gravity still pulls. Light still has a top
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speed. Time still flows in one direction. So, what happens when you tear up the rule book itself? You fall into the ninth dimension. Everything up to now has changed what happens inside reality. The ninth dimension changes reality's rules themselves. Here the
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laws of physics stop being fixed and become just another setting that can be changed. A universe where gravity pushes things apart instead of pulling them together, one where light moves slower than a bicycle, one where time runs backward. Every possible set of physical
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laws creates its own collection of universes, histories, and outcomes. And the ninth dimension contains all of them. There are no rules left to break.
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Gravity time space causality every law you have ever treated as fundamental is simply one possibility among countless others. And once you've explored every possible universe under every possible set of laws, there is only one move left to make. You gather
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all of it into a single point, leading us to the 10th dimension. The 10th dimension is everything. Every universe, every timeline, every version of reality that could ever exist under any possible set of laws. All of it folded into one.
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And here's the strange part. A thing that contains everything is still, geometrically, just a point. But this point is different. The point at the beginning of this video was empty. This one contains every universe, every history, every possibility that could
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ever exist. By the logic of the model, this is the end of the ladder. And it would be a satisfying ending, except reality refuses to stay that simple.
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When physicists try to write down a single mathematical framework capable of describing everything in the universe, from subatomic particles to entire galaxies, they run into a strange problem. The equations only work if reality has 11 dimensions. And this is
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where the mystery begins. The equations demand an 11th dimension, but nobody knows what it actually is. It isn't another branching timeline. It isn't another universe. It isn't another set of physical laws. It is simply there. A hidden ingredient the equations seem to
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require in order for reality itself to function. And that leaves us with one final thought. All the way up this ladder, every higher dimension contains something that would seem godlike to the one beneath it. A being capable of
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perceiving all 11 dimensions at once would stand outside every timeline, every universe, every version of reality. It would see the whole structure the way you see a point drawn on a page. Whether anything like that exists, nobody knows, and nobody ever
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will.
Topics:dimensionsfourth dimensiontime as dimensionmultiversealternate realitiesFlatlandhigher dimensionsphysicsuniverseBluntly Explained
