Flatland. Randall Niles uses the famous illustration of a two-dimensional world to show the power of one extra dimension.
Visit http://www.allaboutthejourney.org to further explore extra-dimensionality and quantum physics.
Also, go to http://www.RandallNiles.com/videos.htm to watch more videos on the interconnection between extra dimensions and the metaphysical realm using illustrations such as Flatland.
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