Are there worlds of higher dimensions than ours?

In the two-dimensional world of Flatland, a humble Square receives a once-in-a-millennium revelation: there's another dimension out there. He is promptly condemned as a heretic. This classic fable—now more than a century old—is itself a multidimensional creation: a sharp social satire, an illuminating mathematical treatise, and a challenge to our most basic perceptions of everyday reality.