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The Fourth Dimension by Drew Olbrich

iPhone Screenshot 1  iPhone Screenshot 2

Last week The Fourth Dimension was temporarily free. It’s an interactive book that’s quite good.

iPhone Screenshot 3  iPhone Screenshot 5

I’m a huge fan of Flatland and Sphereland and the various cartoon adaptations.  This is not an adaptation.

What’s particularly cool: spinning a 4-dimensional tesseract in 3D space as well as in 4D space. Also, by analogy, how a cube’s shadow plays out on a 2-dimensional surface followed by the tesseract’s shadow on 3-dimensions.  Very cool graphics.

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