I got a good laugh out of this cartoon on Alex Baker's Cake or Death cartoon file. And it fits in with this post's point: gestures have their limits.
Susan Goldin-Meadow is a hero on this blog because her work is both serious and original. It fills a gap in our understanding. In 2008 she presented a report on gesture that has stayed with me. It made clear that gestures are a natural way of illustrating what is not included in a grammatical structure. For example, a person might say, "The plane ride was very…" and then illustrate the ride by moving the hand horizontally while simultaneously bouncing it up and down. Ever since that presentation I have been of the fixed opinion that gesture has, from speech's beginning, accompanied spoken words. So naturally I was pleased to see that Goldin-Meadow has published a paper titled "Widening the Lens" in the Philosophical Transactions of the Royal Society – B (abstract; paper). It summarizes her work.