I first wrote about this space at Sparkleberry Crossing in the closing for Al-Amir (which has since returned to the north east with a Sandhill location). I believe Al-Amir was the first tenant in the space, and the interior design somewhat reflected their Mediterranean/Middle Eastern heritage, which you can still see in the shape of the internal windows here. If you look at the Al-Amir link, you'll also see a tile fountain in the center of the foyer. I think that Mirage kept that for at least part of it's tenure, but as you can see here, it is now gone.
Mirage was one of those odd places that never seem to be open when you go by, but never seem to be out of business either. In fact, at least twice I saw the place looking deserted with no cars in its part of the lot and went so far as to park and get out the closing-cam only to walk up to the doors and see that although it was not open, it wasn't out of business either. Maybe it was the name. After all, a "mirage" is something that appears to be there, but is really not..
UPDATE 10 April 2013 -- It's to be Henry's: