6D holograms (from MIT :D )

''The basic concept is similar to those inexpensive 3-D displays sometimes used on postcards and novelty items, that use an overlay of plastic that contains a series of parallel linear lenses that create a visible set of vertical lines over the image. (It is a different approach from that used to create holograms, which require laser light to create.) In addition to three-dimensional images, these are sometimes used to present a series of images that change as you view them from different angles from side to side. This can simulate simple motion, such as a car moving along a road.''

Articles: here (with video) and here.