As much as I hope that your effect is truly exactly how you've described it...I'd have to agree with Aos.
There is no 'theoretical' way of performing the effect to exactly how you've described.
UNLESS, you've come up with real magic- a WHOLE other story...I'd have to say that the effect is indeed quite misleading.
Actually, it is not misleading at all and completely possible.
Get out of your way of thinking that is limited and think of other possibilities.
Keenan