Apple's iBooks Dynamic Page Curl

Please stop implementing page curls, especially for reflowable unpaginated text, especially if you're not using flash and have rich text layout support (as you do in Cocoa).<p>Please do this instead: <a href="http://amarsagoo.info/tofu/" rel="nofollow">http://amarsagoo.info/tofu/</a>

I wonder how long the page curl meme will stay around. Movies are still being identified by the analog movie strip image, but will it still be the case in 10 years?

I haven't looked at the code yet, but I've been curious how they do this. I am not a mathematician, but my understanding is that the affine transform only lets you scale, rotate, and skew the whole image at a time.<p>Is the page curl effect some kind of custom non-affine transform? Or am I missing a simple way to do this using a single linear transformation?