The authors disclose that in less than a century the word "tension" grew from signifying a literal electric charge to a metaphor for emotional stress between two people. Writes Owen Barfield, "The scientists who discovered the forces of electricity actually made it possible for the human beings who came after them to have a slightly different idea, a slightly fuller consciousness of their relationship with one another.

The Fellowship: The Literary Lives of the Inklings: J.R.R. Tolkien