The concept of four and five and six dimensions are brain twisters, at least for me. I was researching entanglement theory when I began to find articles and videos about two dimensional objects. They are flat with only a width and length. Three dimensional objects are created by adding height, so that a flat piece of vinyl can be blown up to a ball, becoming three dimensional.
I became fascinated with the idea of two dimensional objects and worlds, read the book written by Edwin A Abbott in 1881 called Flatland: A Romance of Many Dimensions. It is an interesting social parody about the hierarchy of his time when a lowly farmer could never become involved with a royal. The characters are shown as different shapes, the more sided the higher the level in society.
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Then I began to think of flat creatures who could assume shapes and replicate images, fitting over the Mona Lisa, for example, and never be noticed.
These two dimensional creatures are the perfect spies, the proverbial fly on the wall. They are introduced in The Mac, 1st in the Sir William & Mac Life Without Slippers Series and carry on throughout the series.