Amazon was thinking about a 3D smartphone years ago, as depicted in patents from 2008. The patent which is Amazon CEO Jeff Bezos’ own, details what such a device might look like. The 3D smartphone, would work by tracking its user’s head and adjusting the interface to make it appear to have depth. Some illustrations show a card-style interface that would appear deeper or shallower, or shift left or right depending on where the viewer was looking from. Other illustrations show how an item might appear to physically depress.