h a l f b a k e r y
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The entire case is a multi-touch surface
The case attaches to the micro USB (Apple
users can suck it) and is usable by apps.
It's main function would be as a keyboard so
that people can touch-type with 4 fingers on the
back of the phone, leaving the screen free.
There would be a training mode that displays
the keyboard on the screen
to learn. Function
keys would be round the edge.
Other applications would be up to the
imaginations of app developers, such as for a
game controller or a musical instrument.