A favorite teaching trick of mine, in my work as a tour guide in Europe, is to build a Gothic cathedral out of tourists. It just takes 13 bodies: six columns, six buttresses and a spire. Imagine the scene: raised arms creating pointed arches, plenty of space between the columns for stained glass, and the buttresses taking a step back to become flying buttresses … it’s perfect. When the skinny spire muscles her way into the sky, and the skeleton of support stands strong, all involved will forever better understand the medieval genius of Gothic.