One of our favorite demos and most popular tweets (over 50k views and counting) involved looking at the holographic display made by Proto
Here you can see Erick in the holographic box
But note, that is not him, that is his hologram in that box!
He is located about 30 feet to the right, yet could of been anywhere in the world.
More details here
https://twitter.com/theXRman/status/1611615164901789697?s=20&t=y_ninG__IwkHBKRyN9eiLA