If you look at the crease pattern, it is essentially 1/3 of the Immortal Seashell, the imperfect version with cosine vibration and Phi curvature.
The math is here:
http://www.flickr.com/photos/85937466@N02/8425620808/in/set-72157632637573906
http://www.flickr.com/photos/85937466@N02/8262517007/in/set-72157632644253418
The material:
Artistic™ SS2540 Second Sight Clear Plastic Desk Protector, 40 x 25