Its main point is to make students understand the basic laws of Parallel perspective (one point perspective) and complementary angle perspective (two point perspective); And through the repeated description of gypsum geometry to understand. In order to clearly grasp the perspective of the object, accurately grasp the angle and proportion, we should also draw the invisible part (virtual body), so that students can understand that the cylinder and cone are "cut" from the cuboid.

2. Reasonable structural analysis

Structure is the combination and connection of various blocks that make up a shape. Object structure can be divided into two types: skeleton type and product type. In sketch learning, we should guide students to understand the structure of objects, grasp the structure, and grasp their internal relations and changing laws in essence, so as to grasp the profundity of sketch performance.

3, the orderly organization of the picture

That is, the elements of the picture, "show nature through columns, balls and cones, and see everything through perspective ..." Cezanne's point of view is to discover the orderly structure of geometric forms to painting forms from the laws of nature, that is, to observe and understand the objective natural world as a whole through induction. Following this method in still life sketch teaching requires students to make a meaningful subjective choice of cloth patterns from one point, one line and one side of the object image, the combination relationship between the object image and the survival relationship between the object image and the background, thus forming an orderly overall picture.