I hate to say it, but this is another, probably impractical attempt at the holy grail of 3D displays, the "3D projector" visualized in probably nine out of ever

I hate to say it, but this is another, probably impractical attempt at the holy grail of 3D displays, the "3D projector" visualized in probably nine out of every ten big-budget science fiction films over the past thirty years. It's something we dream of making a reality, but the laws of physics just aren't on our side for volumetric displays. This isn't a problem that's going to be solved until someone discovers some novel property of light that allows two invisible beams to converge into a visible point.