From a 3rd grade perspective

 Third grade artists learned about one-point perspective as a way to create the illusion of three-dimensions on a two-dimensional surface. We looked at street artist Julian Beever who creates fantastic chalk drawings that look very real. After we drew our shapes, we traced the corners back to our vanishing point with rulers, turning our 2-D shapes into 3-D forms.  Lastly, we shaded these with ball point pens, creating value (range from light to dark) using a technique called crosshatching.