I'd add to this: a book is an example of a sophisticated technology that has become invisible as we are familiar with it. Looking at aspects of the history of t

I'd add to this: a book is an example of a sophisticated technology that has become invisible as we are familiar with it. Looking at aspects of the history of the book may help us see how to develop the technology I'm using to write this and that you are using to read this so that it disappears in the same way as the book. Some would argue that direct manipulation interfaces on mobile phones are already part of the way there.