Very Cool Commercial

In the last few weeks there have been several new commercials advertising the new 2010 Toyota Prius. Yet these commercials feature the Prius driving through imaginative landscapes made up of people... People as grass, trees, clouds, the sun, and even rivers and waterfalls.... but how did they do this??? I found this "making of" featurette on YouTube that shows how they made these innovative commercials... it is about 5 minutes long... Enjoy!