alt Hacker NewsI remember seeing an article in OMNI Magazine decades ago about "holographic data storage" which would have been incredibly high-density.
Not sure what became of it.
NYC also used to have the "Museum of Holography" which I was fortunately able to visit but may not exist anymore.
3D stuff, in general, seems to not do well. Not sure why! (as I dust off my Vision Pro)
I went to New York’s Museum of Holography in the 1980’s. It was on Mercer Street but it closed in the 90’s. I remember it was incredible, though, and I saw some techniques on display that I haven’t seen matched since.