Volumetric Projections

Volumetric Projections (aka Holograms) are a very commonly used technology within the galaxy as the tech is so old by this point and cheap to produce. Holographic technology was first developed by students at new Harvard within the Terran federation in 2204 and is done by firing photons at each other so they reflect off and seem to create a spot of light floating in midair. The holographic displays have these photon collisions created in a scan line form like that of the electrons in a CRT monitor allowing a full image to be created.

Uses
Holograms are often used in education to teach students the implications of certain things in physics, show fully 3D images of bodies so students can see how they work, in chemistry to show what different particles and bonds look like on scales that can be easily seen. They are also used in engineering and freight transport to show how things will work in a system and how much space cargo will take up. The smuggler, Graymax Whitehelm, has a small holo-projector on his signature shoulder pad which he uses to answer holo-calls, see how much space cargo will take up, view maps and many other uses. Volumetric projections are the most used technology in the galaxy as they are used pretty much everywhere.