Cross Contour Drawing - What is Cross Contour Drawing?

Often cross-contours look like the contour lines on a map of rough terrain - they help us visualize the topography of a surface. Usually, we don't draw them this mechanically, but use the understanding of cross-contours to help us describe the form with more subtle line or shading. They help us understand the three-dimensional form and describe it on a two-dimensional surface. Contours wrap around a form and obey linear perspective.