http://www.youtube.com/watch?v=LxVDVggLqsA

As another reviewer said…

“I was like – Oh no, another in the line of SL machinima about building something.
La la la.
Just really well editing.
La la la.
But wouldn’t it be cool if something totally unexpected happened, that gave meaning to all of this building, something magical…

and then it did. And I was totally blown away.”

You can find links to higher quality versions here:

http://digitaldouble.blogspot.com/2007/07/watch-worlds.html

Many thanks to Invent http://invent.stumbleupon.com/
for finding this little gem.