[BrainScraps]

Someone else more eloquent than I advocated that we stop using curved drop shadows... I concur: http://delvarworld.github.com/blog/2012/05/14/stop-using-cur...

[antihero]

The way I see it it's to subtly suggest to our heads that it's not the background that is curved back, but the box that has slightly curled up corners, offering an organic, 3D feel.

[walrus]

Maybe the background surface is curved ;)

[rozap]

Which makes me nauseous.