People get distracted when using their mobile devices -to such an extent that they sometimes walk out into traffic.
Today’s invention is a simple safety feature which might help.
Each cellphone camera would have a small double prism which would gather light from either side as one walks along.
The cellphone system’s accelerometer could tell if one were walking and activate the display of sideviews accordingly, as shown.
Anything approaching from either side would then be easily visible on the screen.