This post is by John Gruber from Daring Fireball
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Michael Steeber, writing for 9to5Mac:
Yet, ubiquity has not brought consistency. Each new generation of a product seems to bring with it a slightly different take on space gray. Those with large device collections have noted the discrepancies between shades, and discussions brew online over the term’s exact definition. While subtle variations in material, texture, lighting, and even the shape of a product can play tricks on the eyes, every device Apple currently offers or has produced in space gray can be grouped into one of several loosely defined categories. Below, we’ve cataloged and categorized the vast universe of Apple’s recent dark material finishes in an attempt to unravel the mysteries of space gray.Unsurprisingly, I found this article a lot of fun. Certainly seems comprehensive.