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Tài liệu tham khảo tiếng Anh về hội họa - Drawing Dynamic Hands - Vẽ bàn tay - Phần 1 | 1. FORMS AND STRUCTURES The hand is not a flat two-dimensional shape without volume. It is a dynamic three-dimensional body form energetic and complex each of its forms and structures interrelated. In this chapter we will look at it from various angles in space and depth noting its curves and rhythms and examining the bulk sizes shapes and masses of its individual parts and their relation to the whole. 10 UPPER AND LOWER ARM The main masses of the upper and lower arm arc good examples of the principle of contraposition one form being in opposition to or moving in a different direction from another. For example the shoulder mass thrusts upward. while the direction of the biceps and triceps is frontward and backward the forearm repeats the up-and-down direction of the shoulder and is opposed by the horizontal angle of the hand. The upper sketch shows the retracted and extended arm positions while the lower left sketch emphasizes form planes. Observe how the contraposed masses shown in the lower right sketch produce an undulant wavelike rhythm of crests and troughs along the entire length of the extended arm. 11 CONTRAPOSED MASSES These drawings also show the undulant rhythms produced by contraposed masses direction indicated by arrows . In this sequence of varied movements of the upper and lower arm. note the tendency of the forearm to lift at the upper wrist. The palm takes a decided slope downward depending on the natural flexion of the hand. .
