To sum up the idea, when people move their mouse, depending where their mouse is (and what the pointer is on), different sounds will be made. Internal mechanics could also be utilized to allow touch sensory involvement too, though mechanics tend to make products too expensive sometimes, so it's not nearly as important (at first).
When I was little I used to watched Mister Rodgers on PBS and I enjoyed it. Now that I've got a little one of my own, I'm watching Mr. Rogers all over again! I can't say that I'm as entertained as before, but it's easy to feel relaxed watching it with my kid.