Because it is important to teach the hand what the mind now knows, included here is an illustration of equally spaced, equal-size black circles, which you should draw on a full sheet of paper at a larger scale or enlarge on a copier. Roll your drawing or photocopy of the black circle pattern and observe how the circles become ellipses that define the curve of the paper. On a separate sheet, draw what you see, taking care that your ellipses are rounder or flatter according to their position along the contour of the form (a cylinder) they are describing Now fold the page a few limes, creating multiple planes. Observe, then draw the ellipse pattern as it now appears, conveying the planar changes through your handling of the inclines and proportions of the ellipses' major and minor axes.
On a full sheet of paper, draw or photocopy at a somewhat larger scale the pattern of equal size, equally spaced black circles. Place your sheet of circles on a flat surface and position yourself so you are not looking at it from directly overhead. On a separate piece of paper, draw the pattern as it now appears as a series of ellipses whose minor axes grow smaller as the shapes recede away from you. Then, take your original sheet of circles and roll or fold it into various configurations. On separate sheets, draw what you see-the pattern as it describes the contours and angles of different planes.