Layering is particularly effective when there is a notable contrast in the shade or texture of two overlapping objects.
当两个物体在色度，质感上发生对比的时候，层次感非常强烈。
This program works to achieve pile from top to bottom, left to right to sequentially numbered, and can eliminate the phenomenon of overlapping objects duplicate Numbers.
本程序实现工程桩从上到下、从左到右进行顺序编号，且可消除重叠对象重复编号的现象。
Placement is to embed many objects on a plane without overlapping each other.
布局是将众多对象互不重叠地放置在一个平面上。
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