The Apple Watch may be a polished product — both figuratively and literally — but it started life as little more than an iPhone with a Velcro strap, according to a new report from Wired. This crude prototype was chosen partly out of necessity (the Watch was developed on a tight deadline), but also because Apple knew that its first ever wearable would live or die on the strength of its user interface.

Pierce's article reveals all sorts of interesting tidbits about the development of the Apple Watch, including the process by which the human interface team finessed the vibrations and sounds used for notifications. The designers turned to synesthetic methods, converting all manner of noises into prods and buzzes to find out what felt right on the wrist. Interestingly, the audio samples they used even included the sound of a lightsaber — an object that we already know is one of Jony Ive's many areas of expertise.