Couldn't be, surely - you can't fold up a circle to get a sphere, let alone a hypersphere, and besides the unfolded hypersphere HAS to be 3D.
I mean, an unfolded tesseract is one of those 3D crucifix looking thingys - five cubes in the shape of a plus sign, horizontally, with one cube on top and two below.
I've never been happy with the cube-within-cube thing - it doesn't make sense to me that the same way that folding and unfolding the tesseract does. However, circles-wthin-circles will do until I come up with a better representation of it.
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I mean, an unfolded tesseract is one of those 3D crucifix looking thingys - five cubes in the shape of a plus sign, horizontally, with one cube on top and two below.
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[As seen on mathpuzzle.com. Requires Java. And a decent CPU wouldn't hurt.]