What is the 4th dimension?............if the 3rd dimen.........is the visible world u see fit to sexually harass me in.....................................................and includes everything u can see, hear, touch, etc.........what is the 4th d??  Beyond the visible..............a hypercube is said to be 2 3d cubes...................a cube in the 4th dimension.........is called a hypercube.........by some people anyways......

How to Get to the Fourth Dimension - Scientific American

https://www.scientificamerican.com/article/how-to-get-to-the-fourth-dimension/

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Jul 31, 2015 - Things to Make and Do in the Fourth Dimension: A Mathematician's Journey through Narcissistic Numbers, Optimal Dating Algorithms, at Least Two Kinds of Infinity, and More, by Matt Parker. Farrar, Straus and Giroux, 2015; 464 pages. Mathematics popularizer Matt Parker, an Australian based in England, ...