The first thing that came into my mind after reading the project 3 outline was "The impossible game". I know this is a game, not an interaction, but I think it's a great example of how really simple thing can be really interesting and fun to play with, which proves that something interesting and amazing doesn't mean something complex. I probably should tell a little bit about the game itself. "The impossible game" is an i-pod application. Basically the rules are you touch the screen at the right moment. When you touch the screen, the little cube jums over the obstacles and if you don't do it at the right moment it explodes and you start the level from the very begining.
Also what I love about this game is that the cube is supposed to jump to the beat, so the music is used to help to get the right moment
