[ctdonath]

Two other key factors for the curved back:

- unless you look at the device edge-on right at 90 degrees, it looks much thinner than it in fact is

- when placed on the table, it gives a subtle illusion of floating.

Both contribute to a subjective "wow!" response, where other practical designs don't.

[nazar]

And its easier to grab it. with flat surfieces one would be forced to push it till the edge of the surface, like when I try to pick up coins from table, PAIN!