Aphorism enthusiast and author James Geary waxes on a fascinating fixture of human language: the metaphor. Friend of scribes from Aristotle to Elvis, metaphor can subtly influence the decisions we make, Geary says.
For a more scholarly look at the subject, see the work of Lakoff and Johnson. Metaphors We Live By is a good starting work. For the more philosophically inclined, try Philosophy in the Flesh : The Embodied Mind and Its Challenge to Western Thought. For the mathematically inclined, Where Mathematics Comes From: How the Embodied Mind Brings Mathematics into Being (Lakoff & Nunez). If you like provocative titles, Women, Fire, and Dangerous Things: What Categories Reveal About the Mind (Lakoff) extends the work to cognitive science and philosophy.
I liked his delivery. The subject itself is interesting enough. He has also written about the ways in which metaphors become so commonplace that we don't notice they are metaphors any longer. I have done some writing activities with high school students writing fresh metaphors after using the almost buried ones.