在美国西雅图市现代美术馆门前,有一座高达十几米的薄板状钢铁雕塑:一个正在挥舞铁锤的男人。这就是美国雕塑家约拿丹·博罗夫斯基创作于1992年的雕塑作品《举锤人》(图1)。这件雕塑有两个明显的特点,第一,雕塑是以剪影的形式而非传统的三维立体的形态呈现,十多米高的雕塑厚度只有40cm左右;第二,此雕塑并非静止的,而是在动——其中那支举着铁锤的胳膊能够缓慢并有节奏地上下活动,而所有机械动能装 In front of the Museum of Modern Art in Seattle, the United States, there is a sheet of steel sculpture up to ten meters: a man wielding a hammer. This is the sculptor “Hammerman” (Figure 1) created by the American sculptor Jonathan Borowski in 1992. There are two distinctive features of this sculpture. First, the sculpture is presented in the form of a silhouette rather than a traditional three-dimensional figure. The thickness of a sculpture of more than 10 meters is only about 40cm. Second, the sculpture is not static. Is moving - in which the arm with the hammer can move slowly and rhythmically up and down, and all mechanical kinematics