10. Conclusion

“It is true that we have really in Flatland a Third unrecognized Dimension called ‘height,’ just as it also is true that you have really in Spaceland a Fourth unrecognized Dimension, called by no name at present, but which I will call ‘extra-height.’ But we can no more take cognizance of our ‘height’ than you can of your ‘extra-height.’ Even I—who have been in Spaceland, and have had the privilege of understanding for twenty-four hours the meaning of ‘height’—even I cannot now comprehend it, nor realize it by the sense of sight or by any process of reason; I can but apprehend it by faith.”

—Edwin Abbott, Flatland: A Romance of Many Dimensions1

Figure 10.1 These two figures are both two-dimensional views of the same octahedron. ...

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