Long time ago i went to se an holografic expo

the ones i most remember were the picture of a fisher king with a fish on is beak, despite being aware that it was a flat plate the illusion of the fish hanging in the air from the bird beak beyond the wall, it was amazing, put the hand against the wall and still the image seem closer than the hand and the wall, cover part of the hologram with the hand and being able to see it complete by looking throught the side like in a real window

another had the picture of an optometrist shop with a vision chart at the end and a pair of glasses seeminly closer to you in the air, in front of you and they worked as real glases do too, looking throught the glasses you could see the symbols in the chrart and the things in the shop bigger, not looking though the glasses you could look at the room and the chart as if not using the glasses, and standing next to the picture the glasses were closer close next to you than the wall

another had a microscope with an electronic chip on its glass plate, you could approach the microscope tiny lense and see the amplified details of the chip like using a real microscope while feeling that the microscope was closer to your eye than the wall

we get fooled that those are 3d because they are, the flat plate is not just an usual photo, it contains the reconstructed 3d image as intersection waves iluminated from a source that is reflected by a mirror into another point of light hitting the picture from a different angle

The plates i saw were higher quality than the star wars thing, but there are labs working on systems that can also project it that way, a problem that we have is that to do it with moving images is very difficult, you need to capture the complete 3d information for the reconstruction of the image and its surroundings and the objects are moving

but there are people working on different methods, from memory MIT tensor holography...and others, no idea of the quality or how far they are thought