This very cool project was built by Steve Tester using an Eleven, a ProtoShield Short, a Terminal Shield, and various other bits of hardware.
The Eleven controls a stepper motor that "winches" the dolly along the tubes while the camera takes a series of photos, which can then be stitched together to form a time-lapse video.
Check out the details on Steve's blog, including a time-lapse video of the end result: http://tester.id.au/?p=248
