Having tried many handheld devices, I conclude I want the following shape features: it must be usable with one hand only. It must be usable by either hand.
If two hands are needed, one to hold the device and one to operate it, or two thumbs, then the hands are forced together, and we need to maintain the same arm position for the entire time using the device. This becomes fatiguing.
It's like a Wii controller, except with a screen. On the bottom side, one or two buttons shaped like triggers to be operated by the index and middle fingers. The main typing is done by the thumb on the top side. Some buttons, maybe a joystick or nipple mouse, maybe a touch pad with small display.
Above the thumb area is the main display.
A Nunchuck is a good idea for optional two handed operation.
Chords
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