This is a sketch of the projected artwork. The artwork responds to sound, so make sure to allow your mic to be turned on.
In reality, the piece must be calibrated carefully to the sounds of the city, so it responds gently to most but not all sounds.
Open the window or play city sounds like this ( audio need to be played from another browser or system, so for instance: open youtube with safari and open this page in chrome). 

This prototype uses one layer of animation. My proposal is to use 3 layers of gauze after each other, suspended over the canal.
The projection goes through the gauze, creating a mesmerising sense of depth.

daniel samama