2 layers of reality

Augmented reality seems to take many forms. What would the world be like if people could essentially cast illusions over the world?

Some forms of augmented reality are utilized in academic fields such as archaeology. What other areas are making use of augmented reality and how are they using it?

Is there any research about making augmented reality tangible like the panels Tony Stark uses in Iron Man 1 and 2?

Tags: augmented reality, illusions