It works! As you said, a single ball on the screen.

Question 1: what kind of parameters a these:

>:x1 => 10, :y1 => 10,
>:x2 => 20, :y2 => 20,

is it a kind of width/height? which variables point to the center of da 
ball,? I need it in order to manage its position using the coordinates.

Question 2:

what method like "repaint()" or "clrscr()" or "cleardevice()" could I 
use in Ruby to make the ball dissappear?

Thanks a lot!
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