Apple aesthetics: A look at the iMac's design history

A new version of Apple's iMac desktop machine doesn't always come with a retooled exterior. As has become the norm with the MacBook Air and MacBook Pro, a spec boost via new internals is the case more often that not. This week, in addition to packing in a load of updated components, the company outfitted the all-in-one option with a new high-res Retina display that should translate to some stellar views. With a product line that dates back to the late '90s, let's take a closer look at the iMac's notable design changes over the years.