The 4th Dimension is imagination

I appreciate your thoughts here, However I believe it has been fairly well-established and agreed-upon for quite some time that the 4th dimension is time. In fact, The fabric of our universe is often described as "spacetime" or the "spacetime continuum". Gravity is often described as the curvature of spacetime. Einstein is famous for using these facts in his theories of both General and Special Relativity. However, This concept far predates Einstein. Viewing time as the 4th dimension can be thought of in somewhat-simplified terms. When we set a meeting, We might say, "meet me at the 33rd floor of the building located at 14th street and 2nd ave. " However, These directions are not complete. To ensure the meeting actually happens as desired, You would need to specify time as well. However, This is a gross oversimplification. "In 1905, Albert Einstein based his seminal work on special relativity on two postulates: (1) The laws of physics are invariant (i. E. , Identical) in all inertial systems (i. E. , Non-accelerating frames of reference); (2) The speed of light in a vacuum is the same for all observers, Regardless of the motion of the light source. The logical consequence of taking these postulates together is the inseparable joining together of the four dimensions, Hitherto assumed as independent, Of space and time. Many counterintuitive consequences emerge: in addition to being independent of the motion of the light source, The speed of light has the same speed regardless of the frame of reference in which it is measured. " 4D space is a medium of quantum information transfers. Simply stated, The first three dimensions are used to specify an object"s location/movement in space (forward-backwards, Left-right and up-down), While the fourth dimension locates its position in time. All four dimensions are used to specify completely the location or dynamism of an object in space. Collectively the four dimensions are inseparably interlinked and known as space-time. (Ganesh Subramaniam) Four-dimensional space, The concept of a fourth spatial dimension. Spacetime, The unification of time and space as a four-dimensional continuum. (Hermann Minkowski) When we talk about a fourth dimension, It"s considered space-time. (Big Think) "But spacetime is even more complicated than space, And it's easy to see why. The chair you're sitting in right now can have its location described by those three coordinates: x, Y and z. But it's also occupied by you right now, As opposed to an hour ago, Yesterday or ten years from now. In order to describe an event, Knowing where it occurs isn't enough; you also need to know when, Which means you need to know the time coordinate, T. This played a big deal for the first time in relativity, When we were thinking about the issue of simultaneity. Start by thinking of two separate locations connected by a path, With two people walking from each location to the other one. This is supremely non-controversial, And explains why time needs to be considered as a dimension that we "move" through, The same as any of the spatial dimensions. But it was Einstein's special theory of relativity that led his former professor, Hermann Minkowski, To devise a formulation that put the three space dimensions and the one time dimension together. From a physics point of view, The implications are astounding. It means that all massless particles are intrinsically stable, Since no time can ever pass for them. It means that an unstable particle, Like a muon created in the upper atmosphere, Can reach the Earth's surface, Despite the fact that multiplying its lifetime (2. 2 "s) by the speed of light yields a distance (660 meters) that's far less than the distance it must travel. And it means that if you had a pair of identical twins and you left one on Earth while the other took a relativistic journey into space, The journeying twin would be much younger upon return, Having experienced the passage of less time. " (Forbes)