create alias floating_screen -> holographic_monitor
As it is, floating screens may be held up by either hidden wires, propulsion, or simply lack of gravitational attraction. Holographic monitors are those that are based on lasers and light. From this basic description, it might seem meaningful and easy to differentiate between them.
However, a lot of the recent pictures are not easy to categorize. Some, like post #1354867, appear to be a floating pane of glass that functions as monitor, while also being translucent like a hologram. Some, like post #1111022, would appear to be holograms but of interface widgets rather than complete monitors. These complications render the distinction arbitrary, giving it a negligible benefit. Also, figuring out which of these tags to use takes a substantial amount of effort, effort that probably isn't worth that negligible benefit.
If possible and if the system lets us have the transitive alias, the preferred target is floating screen so that the tag doesn't have to apply to complete computer monitors.