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For many, the concept of a hologram was indelibly captured by the scene in the first Star Wars movie, when Princess Leia is seen as a projected image from the endearing robot R2-D2. However, that projection from the mid-1970s was a fantasy for the future; holograms were actually much more varied in their form and quite different from that movie-based illusion. Since that time, holography has had a bumpy ride. On the one hand, it has become ever present as a security device on credit cards and packaging of every sort, and is hidden inside many industrial devices (supermarket scanners, lighting fixtures, and military displays, to name a few). On the other hand, the creative ...