David Lam Park, not far from this photo. The floats at water level cause the angle of the top part to change with the tides, as well as rotate back and forth with winds, currents, and boat wakes. Sensors on the piece transmit information to www.brushdelux.com. It's called Brush With Illumination, and is by Buster Simpson.
A couple of boats from the small ferries that serve False Creek can be seen in the background.
Post title from this song by Litterbug.
This is one of two posts I'll be publishing today, in order to catch up from the several days I missed.