In nature and our lives, many objects have symmetries. Symmetry is important character of object and important portion of human vision perceptual organization system.

自然界和日常生活中的很多物体都具有某种形式的对称性，对称性既是物体的重要特征，也是人类视觉感知组织系统中的重要组成部分。

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In nature and our lives, many objects have symmetries. Symmetry is important character of object and important portion of human vision perceptual organization system.

自然界和日常生活中的很多物体都具有某种形式的对称性，对称性既是物体的重要特征，也是人类视觉感知组织系统中的重要组成部分。

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