[zachrose]

Indeed:

>> Esslinger convinced Jobs that zero-draft tooling was essential. As well as gaining a subtle but powerful precision to the shape of Apple's cases, it decreased their actual size. A zero-draft enclosure could fit more tightly around the components within, and, despite the tooling expense, the resulting decrease in plastic could eventually decrease costs. Moreover, zero-draft molding, being an unusual, complex and expensive technology, helped prevent a growing problem for Apple: unauthorized clones.

http://www.landsnail.com/apple/local/design/design2.html

[brudgers]

That's not aesthetics.