CNN’s coverage of the Presidential election included some interesting segments: hologram interviews. You might have seen reporter Jessica Yellin and, later, Will.I.Am in hologram form being interviewed by Wolf Blitzer and Anderson Cooper respectively. If you haven’t already, here they are:

Here’s the thing though, they weren’t actually holograms. From the CBC: “The CNN anchors were not really speaking to three-dimensional projected images, but rather empty space, Kreuzer said. The images were simply added to what viewers saw on their screens at home, in much the same way computer-generated special effects are added to movies.
Kreuzer said the images were tomograms, which are images that are captured from all sides, reconstructed by computers, then displayed on screen.
Holograms, on the other hand, are projected into space.”
I think I finally have a proper explanation for Cooper’s uncomprehending look following Will.I.Am’s short dance.