多个线条的聚合表示深度范围和距离。栅栏或马路向远方的延伸会聚成一点，给人们造成扁平的二维图像有着三维的深度这样的假象。
Lines that converge imply depth, scale and distance - a fence or roadway converges into the distance provides the illusion that a flat two-dimensional image has three-dimensional depth.
至少有一个非球面透镜位于球面透镜和印刷版面之间，用于将激光聚焦或会聚到一个所需点上。
At least one aspherical lens is arranged between the spherical lens and the printing form, for focusing or converging the laser light onto a desired spot.
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