The metaphor paradigm

The interface is expressed in terms of metaphors.
Metaphors don't scale: file icons worked for floppies, but not for gigabytes.
We may not make the connection between the source and target domains. ``Metaphors are not dependable in the way that understanding is.''

``The success of the Mac wasn't because of those metaphors but because it was the first computer that defined a tightly restricted vocabulary for communicating with users.''