Such a technique ultimately fools the brain in order to "mimic a hologram," according to the patent. Crucially, viewers need no special glasses or helmets. Images can parallax along multiple axes, and there is no need to remain in a single spot for the full effect. What Apple would do with the technology is unclear; while Apple does produce branded displays, it has never sold a projector. Likewise, the proposed system would likely be elaborate and expensive, requiring three different elements that must be positioned neatly around a room.