You can create your own holograph using any smartphone and a -3.75 index prism crystal. The phone is placed on cardboard stands with the screen hovering right above the point of the prism. Once the phone is turned on, you will see a 3D image inside the prism. And unlike some other YouTube videos showing holographic displays, this one is not a concept or a projection but is a real honest-to-goodness holograph.
You can put this together yourself by purchasing the prism crystal from any reputable science store...oh, and May the Force be with you.
source: YouTube via SlashGear