On the Apple Watch interaction model and the digital crown ...

JOHN GRUBER, DARING FIREBALL:

"Here’s a better way to think about it — and without thinking about it, the reason why I think most people aren’t frustrated or confused by the crown button after a week or so. It’s best to think of Apple Watch as having two modes: watch mode, and app mode.

"You do not need to understand this to use the watch. Most Apple Watch owners will never really think about this. But this idea of two modes is central to understanding the design of the overall interaction model."

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