In Einstein’s famous theory of relativity the concepts of immutable space and time aren’t just put aside, they’re explicitly and emphatically rejected. Space and time are now woven into a coexisting fabric. That is to say, we truly live in a four-dimensional universe.
The fourth dimension is a concept that cannot be held in the mind, but can be experienced. The flow of time from past to future is a dimension in its own right. For example, the arrangement of pens in someone’s hand spans the dimension of time from when it was first put together until it falls apart.
To understand the fourth dimension, one can look for similarities between lower dimensions. For example, in zero dimensions, there is no height, width, or length. In the first dimension, there is only one line. In the second dimension, a sheet of paper has no thickness and no measurable height.
One can visualize four dimensions by squishing it down to three. A point in four-dimensional space can be described with four numbers: x, y, z, and w. The w-axis is at a right angle to the other regions.
Math provides tools for representing and comprehending four-dimensional space, expanding geometric understanding
Physicists can describe the fourth dimension mathematically, but they may never experience it physically. However, physicists today generally agree that a fourth dimension exists, although their theories may differ. For example, a String Theorist may say there are at least 11 dimensions.
Most people will never “see” the fourth dimension because our brains are wired to work in three dimensions. In a 4D world, our eyes can only perceive 2D and by combining multiple images, we will still only achieve 3D dimensions.
However, you can get a glimpse of the fourth dimension through an optical illusion called the Necker cube. There are two ways to interpret this shape: as a box oriented slightly left and down, or as its mirror image
Here are some reasons why we can’t visualize four dimensions:
- Brains are wired for three dimensions: Our brains are not wired to picture anything beyond three dimensions.
- No sensory input: As our brains develop, they don’t experience sensory input corresponding to movement in more than three spatial dimensions.
- No survival value: Visualizing four or more dimensions simply provided no survival or reproductive value to our ancestors.
- No visual memories: We don’t meet 4D objects in our daily life, so we don’t have any visual memories of them.
- Eyes are two dimensional: Our major senses, our eyes, are intrinsically two dimensional.
- Depth is an illusion: The depth that we all think we can see is merely a trick that our brains have learned
While cells in other organs work in four dimensions, the brain works in up to 11 dimensions:
- Organ cells: Work in four dimensions: three spatial and one temporal
- Brain: Works in seven dimensions, and sometimes up to 11
The brain creates neural structures with up to 11 dimensions when it processes information. However, our brains can only imagine objects in three spatial dimensions. For example, we can appreciate a hypercube of four spatial dimensions by examining its three-dimensional shadow.
Some say that a thought is produced by the mind and can be four-dimensional. Others say that our experiencing the world might be viewed as from a fifth dimension: Mind
According to SpringerLink, conscious experience is structured in the brain as four-dimensional. Conscious events are linked by spacetime intervals, which may explain why conscious experience appears the way it does.
Some say that consciousness is not a dimension. A dimension is an abstract concept that requires consciousness to imagine.
Others say that consciousness has four dimensions: Phenomenological, Semantic, Physiological, Functional.
These dimensions are described by four different gradable aspects of consciousness: Quality, Abstractness, Complexity, Usefulness.
Some say that the waking consciousness is, in some respects, the fourth dimension to the dream consciousness. In the dream state, there are length, breadth, height, solidity, and a logic of thought which are invalidated in waking.
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