The size of the sides would of course depend upon the age of the individual. A female at birth would be about an inch long, while a tall adult woman might extend to a foot. As to the males of every class, it may be roughly said that the length of an adult’s sides, when added together, is two feet or a little more. But the size of our sides is not under consideration. I am speaking of the equality of sides, and it does not need much reflection to see that the whole of the social life in Flatland rests upon the fundamental fact that Nature wills all Figures to have their sides equal.