So I was thinking, if we wanted to make a 3d display, could we simply have many very small lights that go transparent when not switched on, inside some sort of holding structure (probably glass)?
Kinda like a 3d grid of pixels where you can see past/through them when they're not activated.
You know, like if you wanted to have a sphere it could be something like this.
Does this exist?
If this method isn't used, why not?