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Screen Reversal for Android Tablets.
If one was able to reverse the screen image on an Android tablet, so that it was a true mirror image of itself with all the text back to front, etc. Then we could put them on the top of our car's dashboards and use them as a 'Heads Up', display device.
Could be used as a much bigger GPS navigation unit, that we could see as we drove, or if there was also a bluetooth device we could connect to ours car's computer system, then we'd get a nice heads up display of how our car's engine was performing.
I've done several searches for such an app but nobody's created one yet, it seems. But if it were a built-in feature of Android as it could quite easily be, then it could be standard on every android device, right across the range.