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Through these changes, the overall appearance of the iMac has stayed the same: an aluminum build with black bezels and an aluminum chin.
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In 2015, the iMac was upgraded with a Retina display. While the thinnest point measures 5mm, there’s still an unsightly bulge in the back to accommodate the iMac’s internals and cooling system. In October 2012, Apple redesigned the iMac with an ultra-slim side profile and removed the SuperDrive. This design has ended up shaping the future of the iMac, with Apple focusing on iterating rather than completely redesigning it. In 2009, Apple overhauled its iMac lineup with aluminum unibody design in 21.5-inch and 27-inch variants – introducing the two screen sizes that are still in use today.
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