Very interesting, Doc! I tried and it happened exactly as you said: "Blue Moon On Kentucky" did turn into "Red Rubber Ball", fading away in seconds while my eyes recuperate, and vice versa. It's a great reminder to look in the distance or close my eyes every once in a while before straining or overworking them. Thanks for the tip. BTW, "Blue ..." and "Red ..." are great American songs you might want to take a listen to 😊