Here’s a cool art installation at Place des Arts in Montreal. Walking through the triangular structures causes them to play a series of xylophone-like tones.
Virtual xylophone
11 Tuesday Dec 2012
11 Tuesday Dec 2012
Ricky Leong 
Very lovely – I had seen a photo of the sculpture and thought it looked amazing but the sound is additionally clever. I’m sure the high notes might also repel vermin – giving even further urban benefits!