I like his use of contact microphones to turn this sculpture into an instrument with liberal application of delays and phasing. When I was editing the sound I noticed how the audience's applause at the end sounds like a reprise as the vibrations trigger the effects.
Vic also used contact mics during his Hook performance in August, although they're a bit lost in the video because I only had audio from my Rode VideoMic and it captured more of the hammer hits acoustically.