Very poetic animation!:)

Sketchy physic can be found here :)
http://code.google.com/p/sketchyphysics/wiki/LatestVersion
Docs
http://code.google.com/p/sketchyphysics/wiki/Docs
Examples
http://sketchyphysics.googlecode.com/files/SketchyPhysics-Examples-Jul7-07.zip

This sketchy plug is some amazing! Try it! :)
The ragdoll acrobat in the file example is very funny to use :D
All volumes can be painting or generic modified as normal volumes :)

And you can import any component inside a simple "physic cube" here a french Cathedral, the hide the "cube" and voila:)

You can found 106 free models of cathedral here http://sketchup.google.com/3dwarehouse/details?mid=29d8598f16b6270b31de9651063afcb6
Little Video http://www.divshare.com/download/2852155-43c
unzip and launch anima.htm in your favorite navigator :)

Here I scale the head :)

(the guy say : "it's rainy hard this morning, I could take an Umbrella against monument" :)