I stumbled across this late one night. It is reactable [1] (reac table). It's described as a new musical instrument, which may be true but for me (someone incapable of playing a musical instrument) it seems like a cross between a drum pad and a playstation. Kinda like Rock Band [2], but different...
Anyways, there are a ton of videos of this thing in action on YouTube [3]. They are all strangely hypnotic... Maybe its the electronica or the graphics or the mix of the two. Watching it is sort of like watching those default visualizers that come with Windows Media Player or iTunes. Here are a couple videos, check them out: