What you do is print out a piece of paper. Once it is printed out, you click on either “Wind Turbine” or “Salar Energy” on the site. This will open up a new window that will connect to your webcam. Hold the printed piece of paper up to the webcam and watch what happens.
The picture you printed will fold out and build a screne for you. You can turn and tilt the piece of paper and it will turn and tilt along with you.
There is even a link to the source code using the FLARToolKit so you can build your own if you want.