Have a look at this fascinating kinetic sculpture by artist Todd Dunning titled Mount Rainier. I love the rusty parts, gentle squeaking, interesting forms, and how the piece shakes ever-so-slightly as it moves. Lovely video too!
From the YouTube Description:
First in a series, this 48" H. welded steel sculpture oscillates, shakes and squeaks. 'Mount Rainier' analogizes the complexity of natural systems, according to the artist.
[ Thanks Christoph! ]