Hologram

Holograms are a technology present in the Deus Ex series that is used to construct three dimensional images out of light. They are often used for communication.

Holographic terminals are in use in several games.

Picture quality
The image quality of holograms vary across the games. Holograms in Deus ex and Deus Ex: Human Revolution are similar to in game graphics with only a slight transparency betraying their holographic nature. Simple communication hologram in Deus Ex:Invisible War are tinted blue with rings strobing though the images. Holograms projected NG Resonance kiosks tend to have a slightly higher quality. Eliza is the highest quality hologram know.

AI driven holograms
In the games there several human shaped holograms that representatives of AI's. These are NG Resonance kiosks, Eliza Cassan and Ava Johnson. In the case of Eliza her hologram is good enough to mistaken for a real person, even at close range. It is possible that Eliza Cassan's hologram has a physical component, as Pritchard mentions a 'holo processing cloud'.

Morpheus also has a crude holographic display, although not one that depicts a human shape.