Hermann von Helmholtz, in his book Popular Lectures of Scientific Subjects, discusses extra-Euclidean geometries. He explains, for example, that two-dimensional creatures could not have digestive systems because they would be separated into two parts. A 3D creature would appear to them like a deity, being able to “pick up” (a term that doesn’t exist in their language) a person from a cell and then place him outside, perhaps by turning him right-left.
