Throughout Western civilization the history of memory externalization runs parallel with the experienced disappearance of its artificial, man made, character. An accidental disappearance, however much intrinsic to our experience, that up till now has not been deliberate.

This then is the fundamental change and the design challenge that we are facing in ubicomp; the deliberate attempt of a technology to disappear as technology.
In what respect will it alter our notion of the self as a more or less stable identity?

Will it not provoke an identity building on the ability to change roles in communication environments?
What kind of privacies lay hidden in our new connectivities?

In a mediated environment - where everything is connected to everything - it is no longer clear what is being mediated, and what mediates.