Good article. Thanks.

There was a hologram video show about the life of Albert Gallatin, the US Secretary of the Treasury during the Jefferson and Madison administrations at Friendship Hill National Historical Park, PA. One could see without any visual aid the head of Albert floating and speaking in the air. The park is a low budget one and the showing facility seems to be fairly simple located in a corner of the living room.  I saw the show about 15 years ago and the 3-D show was terminated in recent years.  In other word, the tech is not that advanced.