Two predictions

1 - In 4 years, most homes will have 5 or more devices connected to the domestic wireless network
2 - In 10 years, most devices that are not connected to a domestic network (and therefore, connected to the internet) will be considered obsolete.

What's my point? Under these circumstances, interaction cannot be based on keyboards and touch screen, because we would be flooded by these very quickly. Gesture-based, and physical widgets will probably be used a lot more, so we should think about these new paradigms.

Interactive art installations are a very quick way of testing natural interaction methods because people don't feel that they are being tested, thus, if they are not interested or if the interface is not transparent, they just quit trying to understand it.