"Pepper's ghost" isn't the sort of phrase you hear very often at a show like SXSW. In amongst all the latest generation technology, there aren't too many folks discussing hundreds years old optical concepts. But the the idea's a driving force in the Palm Top Theater, an iPhone case that turns smartphone videos into a miniature 3D viewing experience. The peripheral utilizes three small drop down displays -- the rear is a full mirror with two half mirrors in front it, reflecting images from the phone display into what appears to be a three-dimension object -- and really, it a stunning little effect. The Palm Top requires the use of a proprietary file format that essentially splits the displayed image or video into three parts. The compa
