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The metaphorical structuring of concepts is necessarily partial and is reflected in the lexicon of the language, including the phrasal lexicon, which contains fixed-form expressions such as "to be without foundation." Because concepts are metaphorically structured in a systematic way, e.g., THEORIES ARE BUILDINGS, it is possible for us to use expressions (construct, foundation) from one domain (BUILDINGS) to talk about corresponding concepts in the metaphorically defined domain (THEORIES). What foundation, for example, means in the metaphorically defined domain (THEORY) will depend on the details of how the metaphorical concept THEORIES ARE BUILDINGS iS used to structure the concept THEORY.
The parts of the concept BUILDING that are used to structure the concept THEORY are the foundation and the outer shell. The roof, internal rooms, staircases, and hallways are parts of a building not used as part of the concept THEORY. Thus the metaphor THEORIES ARE BUILDINGS has a "used" part (foundation and outer shell) and an "unused" part (rooms, staircases, etc.). Expressions such as construct and foundation are instances of the used part of such a metaphorical concept and are part of our ordinary literal language about theories.
But what of the linguistic expressions that reflect the "unused" part of a metaphor like THEORIES ARE BUILD-INGS? Here are four examples:
• His theory has thousands of little rooms and long, winding corridors.
• His theories are Bauhaus in their pseudofunctional simplicity.
• He prefers massive Gothic theories covered with gargoyles. Complex theories usually have problems with the plumbing.
These sentences fall outside the domain of normal literal language and are part of what is usually called "figurative" or "imaginative" language. Thus, literal expressions ("He has constructed a theory") and imaginative expressions ("His theory is covered with gargoyles") can be instances of the same general metaphor (THEORIES ARE BUILDINGS).
Here we can distinguish three different subspecies of imaginative (or nonliteral) metaphor:
• extensions of the used part of a metaphor, e.g., "These facts are the bricks and mortar of my theory." Here the outer shell of the building is referred to, whereas the THEORIES ARE BUILDINGS metaphor stops short of mentioning the materials used.
• instances of the unused part of the literal metaphor, e.g., "His theory has thousands of little rooms and long, winding corridors."
• instances of novel metaphor, that is, a metaphor not used to structure part of our normal conceptual system but as a new way of thinking about something, e.g., "Classical theories are patriarchs who father many children, most of whom fight incessantly."
Each of these subspecies lies outside the used part of a metaphorical concept that structures our normal conceptual system.
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