A 2D Graphics Test Bed - Computer Graphics: Principles and Practice - page 99

Exercise 4.3: Modify the test bed to display only a single image (e.g., the
water lilies) until a button is clicked; each time the button is clicked, a new image
should be displayed (perhaps cycling through a collection of four or five images).
To make a new image appear, you'll need to update the BitmapSource . This exer-
cise is somewhat harder than the previous ones, because we've given you less
guidance.
Exercise 4.4: Read about motion-induced blindness at the end of Chapter 5,
and then write a program that lets you experiment with it, including changing the
grid spacing and colors, changing the color and size of the “disappearing” dots,
and altering the speed with which the grid rotates. Try to determine the settings
that induce the “blindness” in you most effectively.