ARTag is an «Augmented Reality» system where virtual objects, games, and animations appear to enter the real world. 3D graphics is added in real time to video, similar to «view matching» in Hollywood, except that with Augmented Reality it is happening online.
I was playing around with some AR markers the other day and came up with this idea. taking just a plain old vinyl record and attaching an AR marker to the label you can track the record in 3D space. The next question was, can you scratch the record?