Go watch this video about Siftables over at the TED website. It beautifully demonstrates why place and physicality matter in information processing and experiences. Plus it's a great tutorial for how to think about programming in Second Life using LSL2. Place, interaction, and relative-positioning -- and then using those to change how your primitive looks -- were some of the most basic building blocks of LSL2. I don't know if David has used Second Life, but there are ton of groups near him at the Media Lab deeply immersed in these ideas. Very cool and congratulations on a talk perfectly tuned for TED.