First colored blocks, now city blocks: Swiss-based collective Rosen & Spademan
has constructed a "music building game table" for creating modular
compositions with transparent blocks, converting improvised
architecture into sound. (thanks, near near future) Their biggest goal, they say: getting people to grab the objects and play.

You can explore this and other projects on their site. My favorite
digital music term comes from their 'soundlounge' project: coach
coaching. Coach-based musicians of the world, unite!