A friend of mine worked on one of the few "laser disc holographic" arcade game machines. (ex: http://www.oobject.com/revolutionary-arcade-cabinets/1991-ho...) The "hologram" was a visual trick involving a large, curved mirror. They had to do a recall after one arcade establishment positioned the machine next to a window. The sunlight shining through the window was focused to a point on the side of the wooden cabinet causing the machine set itself on fire and burn down the arcade! A quick redesign later and they had a variation on the "holographic" effect that used a convex mirror instead of a concave one.
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A friend of mine worked on one of the few "laser disc holographic" arcade game machines. (ex: http://www.oobject.com/revolutionary-arcade-cabinets/1991-ho...) The "hologram" was a visual trick involving a large, curved mirror. They had to do a recall after one arcade establishment positioned the machine next to a window. The sunlight shining through the window was focused to a point on the side of the wooden cabinet causing the machine set itself on fire and burn down the arcade! A quick redesign later and they had a variation on the "holographic" effect that used a convex mirror instead of a concave one.