First they were little, then they added touchability, now Holocube's holograms in a box are going big time -- in that the company's latest model is physically much larger than the others. It's the HC70, a new version with a 70-inch transparent screen that can be viewed from both sides. It's powered by a Windows 7 Embedded machine with 40GB of flash storage from which it can loop between eight and 18 hours of video, displayed via 1080p projector. Y