That and it's super fascinating to watch, over and over. Not that I'd know anything about that.
( I think it starts automatically, so here's a cut tag. )
cerulean_fleur pointed out to me that there are more. Here are links to the three I thought were the niftiest, after this one here, which I still think is the best of all of them.
(Edited after communicating with cerulean_fleur via evil, evil StumbleUpon, which makes homework doing either impossible or more entertaining, your call.)
Aside to memegarden, I don't know if these have too many visual cutaways for your cutie kiddo to watch, I suspect that most of them do, but I thought of her when I was watching the Pogo Sticks.