Cathode Ray Tube
(Work in progress)
I don't think I could explain CRT stuff much better than the wikipedia page, so you're better off looking there, but here are some videos worth watching.
The notable stuff for using CRT's in new installations is that they are finicky, not super bright (don't use them outside), and can sometimes have issues with filming well.
Nam June Paik's Wobbulator
These are essentially a different flavor of a CRT display, but they should be mentioned in the same breath. See some videos featuring these below: