A set of "expressive footwear" has been built at the Media Lab; a retrofit to a pair of Capezio dance sneakers that inserts a suite of sensors to measure several dynamic parameters expressed at a dancer's foot (differential pressure at 3 points and bend in the sole, 2-axis tilt, 3-axis shock, height off the stage, orientation, angular rate, and translational position). These shoes require no tether; they are battery powered and offload their data via a 19.2 Kbaud wireless link. This video clip (6.4 MEG MPEG) shows MIT student and dancer Yuying Chen demonstrating the shoe, using a musical mapping written by undergraduate Kai-yuh Hsiao. This mapping is a very simple application, quickly composed for the Media Lab's Wearable Computing fashion show (Oct. 15, 1997), at which the shoes were debuted. Foot pressure and bend trigger additional notes atop a pedestrian dance sequence. The audio layers are faded in and out as a function of shoe tilt, left/right panning is a function of orientation, wind sounds are triggered with angular velocity and a sonic "crash" is triggered upon hard impact. The shoe hardware was developed at the Media Lab by Eric Hu, Matt Gray, and Joe Paradiso.