You are at your desk at WeSellEverythingAndAnythingMegacorp, the fantastic e-commerce you work for. You’re trying to write some code while thinking intensively about your lunch. Suddenly, a voice break your incredible concentration. It’s Davina, your colleague developer, hired only a few moons ago. She has a problem and she thinks you can help her. She needs to display a directory tree, and she believes that she needs to use recursion. But she never quite understood the concept.