Click here to read more of Tog's response. Click here to read more of this response. Interface is additive, not exclusive. Every interface element adds more expressiveness to our ability to communicate. It's as if interface is a new language, and every interface is another word in that language.
Languages change very slowly - even though a vocabulary can grow quite quickly.
For example, space is one of the most sought-after items on the desktop, precisely because a 2D metaphor severely limits the amount of space available to the user. On the other hand, the 3D interface is all about space - it's an enviornment in which the user has an infinite supply. Click here to post your responses in our Feedbag discussion area. As Mark points out, different mediums enhance different things and for different activities, a CD-ROM does not replace a book. Click here to read more of her response.