Square cells. Celdas cuadradas

¨YOU, WHO are blessed with shade as well as light, you, who are gifted with two eyes, endowed with a knowledge of perspective, and charmed with the enjoyment of various colours, you, who can actually see an angle, and contemplate the complete circumference of a Circle in the happy region of the Three Dimensions - how shall I make clear to you the extreme difficulty which we in Flatland experience in recognizing one another's configuration?¨

Edwin A. Abbott. Flatland. A romance of many dimensions. With Illustrations by the Author, A SQUARE.1884