Using an old industrial load cell connected to an Arduino board, dancers in the cargo room could control light and music with the weight of their bodies in a rope.

The load cell was connected to the Arduino board using an instrumentation amplifier.
The light came from the trusty old diode boxes using Sonnys code base.
The music was controlled by reading the data from the Arduino board using Pure Data and converting it to a midi-controller, that was fed into Ableton Live.

Read more in depth about Arduino and Load cells here:
http://cerulean.dk/words/?page_id=42