The clock of a thousand gears... well, okay, fifty
Homeloo's Jumbo Gear Clock is like a clock that has exploded with the bloating of its own horological guys: more than 50 gears are exposed, churning and grinding their teeth together in a beautifully intricate contraption that takes the Rube Goldberg connotations of even the simplest wound watch to its inevitable extremity. Quite cheap for all those gears too: only $78.
Homeloo Jumbo Gear Clock [Homeloo via Technabob]

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Finally! A huge mass of exposed gears that actually DOES something! Take a cue, Steampunk fans!
Meh, ornamental gears that serve no function inadequately celebrate the beauty of technology.
Even from the small pic, it's obvious that the large center gear and the twelve gears around the edge have no function; even if they do turn it's from being activated by a gear behind them. They don't have anything meshed with them.