N dragon curve using turtle graphics

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Dragon curve. Use the program, Dragon.java that reads in a command-line parameter N and plots the order N dragon curve using turtle graphics. The dragon curve was first discovered by three NASA physicists (John E. Heighway, Bruce A. Banks, and William G. Harter) and later popularized by Martin Gardner in Scientific American (March and April 1967) and Michael Crichton in Jurassic Park.
Describe in a short paragraph how the program works.
dragon_curve_animation

220px-fractal_dragon_curve

400px-dragoncurve_animation

Wikipedia