This is the most amazing collaborative graphic art project. Be patient when it first starts up. After the site finishes loading, you'll first see a strip of text and instructions to click on the bottom. Then the first scene comes up. Click and drag upward very slowly to move forward. Drag down and you'll move back.
This is a loop so you will eventually end up back where you started. About the third time through, you'll want to stop very frequently to take a good look.
Absolutely amazing -- I was truly impressed!