Why Make The New iMac So Thin?

Apple's iMac has been something of an iconic piece since the launch of the original Bondi Blue machine back in the late 90s. Apple updated it alongside the iPad and MacBook Pro and as a result it sports a razor thin edge to its all in one goodness.

Except I'm struggling to see why making it look so thin at the edges was necessary. Surely the desktop is one area where thinness has little importance? Other than looking like a blade when viewed side on there doesn't really seem to be much point in this particular piece of work.

Strange place to focus engineering effort if you ask me...