Apple execs often say they’re as proud of the products they don’t release as they are of those they do – and if you’d like to take a look at some of those unreleased prototypes, then good news for you in form of a new book from influential designer Harmut Esslinger of Frog Design.

The book offers images of numerous previously unseen Apple prototypes, (bigger image after the jump). That’s no surprise when you consider Frog Design was responsible for many early Apple designs, including that of the Apple IIc, and that Esslinger himself defined the ‘Snow White style used by Apple in the ‘80’s.

“We worked closely with Steve Jobs and Apple’s developers to innovate computer usability and appearance, resulting in iconic products with no historic precedent," writes Esslinger.

Of course, we know that it wasn’t a Frog but a Tangerine (Jonathan Ive’s old firm) which ended up leading Apple’s design innovation in the 21st Century – we do hope Apple one day loosens its kimono to show us a few of the things it managed to prototype and then not release in the last ten years, but we still think this title will make interesting reading to any earnest Apple-spotter.

The book: A Fine Line: How Design Strategies Are Shaping the Future of Business, includes pictures along with background stories of various well known design classics, and unseen products.

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