On the ToyhouseWiki website, the word metaphor can be best described using George Lakoff's definition:

Metaphor is imaginative rationality.

参考文献

Metaphors we live by, George Lakoff and Mark Johnsen, 2003, The University of Chicago Press, p. 193 Scientific Community Metaphor, by William A. Cornfeld, and Carl E. Hewitt, IEEE Transaction on Systems, Man, and Cybernetics, 1981.