A theorem that I find extraordinarily beautiful and intuitive to understand is Gauss' TheromaTheorema Egregium, which basically says that the Gaussian curvature of a surface is an intrinsic property of the surface. Implications of this theorem are immediate, starting from the equivalence of developable surfaces and the 2D Euclidean plane, to the impossibility of mapping the globe to an atlas. Wikipedia also provides the common pizza-eating strategy of gently bending the slice to stiffen it along its length, as a realization.
Copy edited (e.g. ref. <https://en.wiktionary.org/wiki/Euclidean#Adjective>).
Peter Mortensen
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