Cadence is an electro-magnetic flip-disc display that chronicles vehicular activity on a one-kilometre stretch of highway during rush hour.
Each vehicle’s headlights are portrayed by two white discs. The fast lane is positioned at the top of the display, below which are the middle lane and slow lane. The curved lane that ascends at bottom left represents the entry ramp, while the exit ramp on the lower right carries traffic off of the highway. The sinusoidal wave generated by the emergent traffic patterns can be seen in the compression and expansion of the vehicles as they travel.
If you view Cadence from the side--perpendicular to the piece--you can see the flutter of hundreds of discs as they carry information across the display. The sound generated by the piece is derived from the subtle clapping of the discs against the display as each circle rotates from one position to another.