This can be seen in the accompanying animation whenever it shows a smaller inner cube inside a larger outer cube. The simplest form of Hinton's method is to draw two ordinary 3D cubes in 2D space, one encompassing the other, separated by an "unseen" distance, and then draw lines between their equivalent vertices. In 1880 Charles Howard Hinton popularized it in an essay, " What is the Fourth Dimension?", in which he explained the concept of a " four-dimensional cube" with a step-by-step generalization of the properties of lines, squares, and cubes. Schläfli's work received little attention during his lifetime and was published only posthumously, in 1901, but meanwhile the fourth Euclidean dimension was rediscovered by others. The general concept of Euclidean space with any number of dimensions was fully developed by the Swiss mathematician Ludwig Schläfli before 1853. published in 1754, but the mathematics of more than three dimensions only emerged in the 19th century. The idea of adding a fourth dimension appears in Jean le Rond d'Alembert's "Dimensions". This concept of ordinary space is called Euclidean space because it corresponds to Euclid's geometry, which was originally abstracted from the spatial experiences of everyday life. For example, the volume of a rectangular box is found by measuring and multiplying its length, width, and height (often labeled x, y, and z). Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called dimensions, to describe the sizes or locations of objects in the everyday world. Four-dimensional space ( 4D) is the mathematical extension of the concept of three-dimensional space (3D).
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