The Illusion of the 4th Dimension: Within a 3D Frame Refreshing Every Moment
For a long time, humanity has believed itself to stand upon a grand stage known as "four-dimensional spacetime." We have explained the universe by adding a fourth axis—"time"—to the three spatial axes of width, length, and height. Yet, when we intuitively retrace our senses, a chilling question rears its head: Unlike space, where we can freely wander and alter our position, can "time"—which we can never once halt or reverse—truly be called a dimension equal to space? Rather than accepting an uncontrollable element as a dimension, wouldn’t it be more natural to view ourselves as living in a "three-dimensional world that infinitely resets every moment"?
The Decisive Inequality Between Space and Time
Within the dimension of space, we are autonomous actors. We can climb upward, step backward, or stand still at any moment to look around at the path we have traversed. On the axis of time, however, we experience utter helplessness. We cannot slow its flow, nor can we return to the gone-by past; we are merely pushed forward in a single direction.
Presentism—or three-dimensionalism—supported by certain factions of philosophy and phenomenology, focuses precisely on this point. According to this view, the past is merely a lingering remnant of vanished memories, and the future is an unreached, virtual illusion. What actually exists is strictly the three-dimensional cross-section of "this very moment." The universe may not be a continuously flowing four-dimensional mass, but rather a three-dimensional theatrical stage being refreshed in high definition with a brand-new screen every instant. This means that the flow of time we perceive might not be movement across dimensions, but rather an "illusion of change" created as matter continuously shifts position within three-dimensional space.
Why Physics Calls Time a "Dimension"
Why, then, did modern physicists—most notably Albert Einstein—insist on binding time as the "fourth dimension"? It is because the moment one enters the realm of cosmic speeds and gravity, space and time are no longer independent; they become interwoven and interchangeable. Traveling at speeds close to light means one’s spatial movement dilates someone else’s flow of time. To physicists, time was part of a single, inseparable fabric—a four-dimensional, solid sculpture known as "Spacetime."
According to Einstein’s four-dimensional Block Universe theory, the past, present, and future do not reset every moment; instead, they exist as a fully completed whole, much like a film strip. This perspective suggests that because our "consciousness"—acting as the projector light—moves across the film strip one frame per second, we merely suffer the illusion that the world is being newly created in real time through three-dimensional resets.
Human Existence: Living Through the Frames
Ultimately, whether the universe is a massive, pre-completed four-dimensional sculpture or a sequence of three-dimensional frames refreshing anew every instant, human life as we experience it remains astonishingly wondrous.
Bound to time’s uncontrollable arrow, we live out our lives enjoying only the flat, three-dimensional cross-section of each moment. Yet, through the vast projector of our consciousness, we simultaneously reminisce about past frames and predict those yet to come. Rather than lamenting that we are trapped in an "uncontrollable fourth dimension," we can fully savor the "three-dimensional present refreshing vividly every moment." Perhaps pouring all of one’s energy into each of these infinitely resetting, high-definition moments is the most beautiful answer a human being can offer before the distant mystery of time.
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