Take a strip of paper of this size, so she wrapped once our glass - our cylinder, and this band will hold a pencil diagonal, that is, the line connecting the two opposite corner, then wrap it with something glass and fix it in that position, thread or eraser. Then the straight line becomes a screw, the beginning and the end of it will be now on a single generator. It's the need to draw. This spiral then will draw properly and easily when we mentally go through her journey, bypassing around our cylinder, drawing the entire helix. In addition, it is necessary to draw on the small square pieces of paper a circle, square, triangle, rectangle, etc., and attach them to the cylinder, draw together. First plane figures triangle, quadrangle, circle or straight diagonal, then laid on a cylindrical surface and facilitate it, will contribute to a sense of movement on the surface, that is, we mentally to evade cylinder around to what most are striving for. The challenge will be in how to properly assess the reduction in the figure depending on the rotation with respect to its IP. These exercises should be done first from life, and then only on the proposal. It must be remembered that the lower and upper sides of the square are not straight lines, circles and arcs, parallel to the ground, and what a square close to the edges of the visible world of the cylinder - horizontal side of the paper will be less. These figures can also arrange for a particular system, symmetrically, that reminds us of placement of eyes, nose, mouth and ears on the human head. This problem will cause additional motor sense and will eventually help you draw the head. To more clearly express the roundness surface can be for it to hatch on one or both sides. Thus it is necessary to have strokes, so that they did help to create the impression of rounding. The strokes should go in a form that is repeating circle line the base and along its length to end with any one generator, and if these rules are not followed, then the wrong shading can, on the contrary, to destroy the impression cylindricity, uplostit form or crush it.