James found a moving desktop background of a Koi pond:
We were curious if the cat could see it. The answer: He sure can!
He found it extremely entertaining for some time. The fish respond and swim away when touched, and he batted gently at the screen (claws in, what a good kitty!) for a good 10 or 15 minutes.
He was such a patient little hunter, but eventually realized that he couldn't get the fish no matter how fast he was, and waltzed away, trying to show us how awesomely aloof he is. I love our kitty! He's about 14 years old now, but in such great shape and health, and so gentle and loving with Liz, we are really lucky to have such a great cat. :)