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magnification ability and intesity of light emmitance from device would play a key factor of capability applied to the back of phones and tablets somewhat like projectors we have clocks that can project time in mid air,lcd projectors then dsp projectors laser projection to think about it we already have laser pionter pens that go some distance laser disco lighting.inside the screen of tv of the past it all began from the colour gun i had the idea too phones and tablets with their own incorporated stands all comments above are relevant this is more than a possibility i prefer to call it an up and comming capability.