The new iMac all-in-one desktop computer from Apple goes on sale today, and it includes a significant hardware redesign. Apple has cut bulk and thinned out the edges with a tapered design that is only 5 mm thick at the edge. Leaving aside what’s new under the hood, the case itself is impressive enough that it merits a good look. Here’s what the new 21.5-inch version of the iMac looks like, and how it stacks up to other Apple hardware, past and present.