The DataTiles system integrates the benefits of two major interaction paradigms: graphical and physical user interfaces. Tagged transparent tiles are used as modular construction units. These tiles are augmented by dynamic graphical information when they are placed on a sensor-enhanced flat panel display. They can be used independently or can be combined into more complex configurations, similar to the way language can express complex concepts through a sequence of simple words.
Doesn't sound that impressive? Check out the video on the site, it is very cool. I wonder how far away we are from being able to mass produce this, because it would be very cool to have.