- Donate $5 to save the world fund.
I believe that could have been done by first creating a 'ribbon' of different slices of images 'pasted' together in a long strip. Then the series of twists could have been performed using AV Brothers' Page Curl Pro which is actually a little 3D environment which operates within Photoshop. Once the twists and were applied, just a transform operation to taper the 'ribbon' would accomplish the perspective effect. Here is just a simple regular twist given to two intertwining strips using Page Curl Pro.
<http://homepage.mac.com/wellesgoodrich/DNACurl.jpg>
There's a free demo available...