Here’s an interesting video where physical pieces are used to manipulate simulations using a multi-touch screen. Very interesting, with potentially lots of possibilities.
Pico is a computer interface that can move electromagnetic pucks, merging the digital and physical worlds. In this video from earlier this year, see how researcher James Patten has used his unique combination of projection, magnets and computing to help visualize problems such as determining the best place to put a group of cellphone network transmission towers. Imagine the games you could play with this thing!