Perhaps I'm being picky, but I really don't see this as Polyphonic. Everything is lined up neatly in rows and columns, and if this were music it would most definitely be homophonic as everything is in a unified rhythm. There's bad jpeg artifacting in the top right which could have been solved by saving with less compression at 150kb. Lastly, I don't think the square crop suits this very regular composition. Some great tones here though.
I never deduct points because of titles, but isn't polyphonic a number of simultaneous sounds/tones? I'm not getting sound or music from this photo. Its a bit grainy and distorted in the upper right. Nice entry though. 6