A VRD by brother called AirScouter.
VRDs other than regular HMDs project the image directly onto the retina.
[youtube=http://www.youtube.com/watch?v=9I0hF0cbw8E]
Painting with a laser
This project allows to paint virtually with a laser. The laser is tracked with a camera while the software generated “painting” is then projected with an video projector. The Source code for the tracker is open source. How To and source code