Let's use the Pen blocks so that the ball leaves a colorful trail marking where it has been! 1. When the user clicks the green flag, make the ball go to a random position. 2. When the user presses the spacebar, make the ball move 10 steps and bounce off the edge. 3. Every time the ball moves, also place the pen down to start drawing. 4. Every time the ball moves, also change the color of the line. 5. When the user clicks the green flag, also make sure any existing drawings are erased and the pen is up before it goes to the random position.
