hmmm, yeah. blurry or worse. But, if we are talking about some sort of artistic installation or demonstration then you could position the observers near the (projection) sources. but it would still be blurry I know. It would be a neat effect but I think people all over the world have been...
I'm no physicist but I play one on the Internet. Ionization aside, I have noticed that those reflective coatings used on stop signs and license plates (which contain little glass beads) seem to have the strongest reflection in the opposite direction. In other words, the closer to your eye the...