Problem 7bCreate a generally smooth gradation of white to black, from left to right using only a 100 percent black pen.
 
code this was inspired by Christo's running fence. made of nylon fabric as a sail, it creates beautiful wave patterns in the wind.

i have used superimposed ellipses to feign this effect. the intervals and lengths of the 'fingers' are random. the action is initiated by the mouse click.