Block Jam: Musical Dominoes 

A project which came to my attention via
Music Thing (via
We Make Money Not Art): Sony's
Block Jam.
This system is interesting for a number of reasons:
- it's physical: the blocks have buttons and lights, and are connected manually, causing musical pulses to move between the blocks which flash in response;
- it's stateful: there are routers which can change direction on each pulse they receive;
- it's two-dimensional.
There are Quicktime movies of the system in use
here and
here and a Shockwave Demo on the main page. More technical details
here.
It's hard to tell exactly how sophisticated it is musically - it's basically a collection of state machines with a sample library - but it looks fun.
Of course, that old bugbear of "allowing anyone to make music" rears its ugly head. I don't see Block Jam as a musical instrument, and it appears to be of limited use in musical education; it certainly isn't a compositional tool. It's a toy. Chill, people.