Tesseract
from Fancyclopedia 1 ca. 1944
A solid of four spacial dimensions. Its characteristics, as the number of sides, edges, etc, are easily worked out by analogy with the generation of a cuboid by a plane. Below are shown two common picturizations of tesseract cubes, with the analogous ways of drawing 3-d cubes:
F1-Tesseracts.png
Page tags: obscure_fact