Q: What in the name of "bob" is it?
A: It is an anomaly on the complex plane; something that is strange & unusual; Big and small, out of the ordinary.
Q: Just how big is it?
A: Size is not everything friend, it's about scale. Actualy it is 3.1415927 horizontally. Did I mention that it is also infinite?
Q: 3.1415927 what? and infinite? Please explain.
A: 3.1415927 is an arbitry value, it's all about scale; infinite because you can never run out of numbers. Explain it? How long have you got?
Q: Why are you doing this?
A: Because it is an interesting problem involving mapping, computer graphics & nonlinear differential equations. Hey look, I just don't have the time, wikipede it or "use the source luke".