Ivan Sutherland's Early Light Sketchpad - 1963

This is a video of Ivan Sutherland demonstrating his light Sketchpad back in 1963. Ivan Sutherland, for those of you who don't know, is one of the fathers of the Virtual Reality movement (note: I have to say "movement," because that's all it was as the industry floundered to some extent - I know - I saw it) as well as being an all around computer innovator in every way. This technology he displays is still exciting!  What happened to it?

Tracy Swedlow