The key challenge then is how to get you to wear the device, potentially all the time.
Now, I know one thing you’ve never liked to wear all the time – the watch. No matter
how small or elegant, watches are simply obtrusive. That’s the reason you don’t wear
one to the shower, and take one off just before slipping under the sheets. For something to be truly intimate, we’d need to get all the excess material out of the way. No screens,
no buttons, no fumbling with straps. It couldn’t afford communication, imaging, mapping controls. It couldn’t be a replacement for the smartphone, rather the smartphone would provide an interface to it.