As a child, you probably found yourself twisting the spiral that bound your notebook together, watching it circle through the holes down the side of the paper. It looped through a hole then through the next, over and over again all the way up the page. The spiral is a bit mesmerizing to both the eye and the touch. In education, we use the analogy of a spiral to describe a type of teaching.
A spiral approach to teaching means students circle back to learn about topics multiple times throughout their education, allowing them to remember more at a greater depth as they advance through their studies. BookShark Science uses this spiral technique.