City Sonata 3D began as a mixture of a previous live performance system, and a desire to create a new mode of video interaction suited specifically to 3D. I wanted to make connections between audio and video as explicit as possible, at least at the start. For the “city” portions, audio elements created on the fly (sequences of samples, synthesizers, drums, etc) are mapped to city elements (buildings, mailboxes, lampposts, etc), to create a unified audio & video rhythm. These relations become strained in the middle, more abstract portion, in which shape size and position are mapped to less tangible audio parameters.