Modify the program in Exercise 23.11 to add shadows. As a ball moves, draw a solid black oval at the bottom of the Pane. You may consider adding a 3-D effect by increasing or decreasing the size of each ball when it hits the edge of the Pane.

Exercise 23.11

Modify the program to add a new ball each time the user clicks the mouse. Provide for a minimum of 20 balls. Randomly choose the color for each new ball.