Great movies enable us to suspend reality. For a moment we forget that we are watching actors, special effects or listening to a soundtrack, we are engaged with the experience.
The first time my wife and I played Wii it was a similar experience. The remote was easy to operate that we did not think about how to play, it disappeared and we had fun playing.
Interfaces should disappear, enabling people to focus on completing tasks, helping people to get into their flow. They should make people more efficient and create a sense of delight. Each time people have to think about how to use the interface, it prevents them from focusing on reaching their goals and entering their flow.
Its like watching a movie only to notice a major flaw and you are quickly reminded that its only a movie.
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