All of this reminds me of an article I recently saw in the papers. It was about a image projector that could make an image appear in thin air right above itself. Supposedly sucked in ambient air and "treats it" in some manner and then shoots it back out the top (like a toaster).

Don't know exactly who what why or where, but sounds like it may have a scanning disk inside. Dunno, but what's old is always new again.

Anthony