文档介绍：***叶明瑶
***是一种视觉现象。
头饰变化,是通过人的视觉奇幻所产生的一种视觉反映。
自然界中,凡是我们眼睛能看到的地方都存在着***。
近大远小的视觉现象,被称之为***。
《清明上河图》张择端
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