Just ask anyone working in advertising: nothing is better for selling an idea than an analogy. Think sports cars and the ubiquitous attractive young woman draped over the hood. As instructors, we know intuitively that, beyond marketing hype, well-constructed graphical metaphors and analogies are great aids for novice learners grappling with new and unfamiliar concepts.
But while advertising relies on the surface analogy, deeper learning requires the structural analogy, which involves corresponde