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