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If you want to really understand what the "fourth dimension" is, simply study the properties of lower dimensions in relation to higher, and then take it one step further to determine the properties of a four-dimensional figure, which is called the tesseract by some. What's interesting is that this tesseract, once actually illustrated, is really only one cross-section of reality, a frozen moment in time. The "real" tesseract extends beyond the moment, existing simulaneously in the past, present, and future. Of course, this is more a logical and psychological analysis of our relationship to the fourth dimension, which is generally viewed as the phenomenon of time, although it's much more than that. Once understood, you come to the conclusion that the the universe is "at least" four-dimensional and that, due to limitations of our minds, we can see, or experience, only one cross-section, only one infintessimal "slit" (we call the present) of a reality that exists beyond the "now," simultaneously in the past, present, and future. Our experience of time is determined "internally," not externally. The fourth dimension may be interpreted as the phenomena of motion requiring time, but I tend to think that these phenomena are nothing more than our experience or perception of time due to limitations in that experience or perception, and that the "real" world without "motion in time" is the true so-called fourth (or possibly higher) dimension.
"Each conscious mind is alone in the universe!"
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