Re: Holographic image projection display

> He said to me that there was this display that looked 
> like a hologram that was 3d in image and when he tried 
> to put his hand through the image that nothing happened 
> and and the picture reamined unchanged.

That sounds just like a hologram.

Hologram images can appear to float in front of a glass plate, or they can
appear to float behind a glass plate, or they can do both, with some parts
of the image extending right through the glass plate.

[note added by MadSci Admin:  Do an Internet search (such as
Google) on "hologram" and you can find tons of information!]