Or like a realistic image of a plane flying into a building?
John Lear tells the story of a friend (Hollywood insider) whereby they attended a talk on the evolution of the TV. A full auditorium- the talk was boring as hell. The talk drones on and on as speaker walked around on and off the stage seemingly excited about “the history of of the tube from b&w to color” and so on.
Then suddenly the speaker says “ and this is where we are today”. He turned to them and disappeared right before their eyes. A Hologram. With audio among other sensory things. The audience was stunned. Very real- and quite a while ago.
Check out John Lear on Project Camelot.