This Week's word at Every Inchie Monday is brain. Now, in chapter 10, there is a "Sub-Meson Brain" which is involved in the creation of the improbability drive of the Heart of Gold, but I prefer the reference to Marvin the depressed robot who complains: "Here I am, brain the size of a planet and they ask me to take you down to the bridge. Call that job satisfaction? 'Cos I don't." [chapter 11] I do love Marvin.
The human brain is such an amazing thing.
Too hard to quill anything that looks like a brain, so my quilled inchie relates to that moment of brain flash when you get an idea: (Does it look much like a lightbulb?)