This is art and a game in one and is a Sequel to the original. I really enjoyed both the game play, the moving art, and the music. The two interactive photos have 6 slight differences. You test your skill at clicking on each of them before a new puzzle is presented.
http://www.kongregate.com/games/Ivory/6-differences
Original Puzzle: (https://presson.wordpress.com/2007/10/28/find-the-differences-game-with-animated-scenes/)
A Day in the Life of a Presson... 
even more fun than the “daylight” version, since this one has moving objects.