This is what you can do with a lot of time and a lot of toothpicks...
"Thirty five years ago I had yet to be born, but artist Scott Weaver had already begun work on this insanely complex kinetic sculpture, Rolling through the Bay,
that he continues to modify and expand even today. The elaborate
sculpture is comprised of multiple "tours" that move pingpong balls
through neighborhoods, historical locations, and iconic symbols of San
Francisco, all recreated with a little glue, some toothpicks, and an
incredible amount of ingenuity. He admits in the video that there are
several toothpick sculptures even larger than his, but none has the
unique kinetic components he's constructed."
http://thisiscolossal.com/2011/04/one-man-100000-toothpicks-and-35-years-scott-weavers-rolling-through-the-bay/
Watch the video for the full scope of this amazing sculpture.