The capital of an Ionic column features a disk known as an oculus at the center of each of its spiral scrolls.

 
  • 包括圆形或椭圆形的小窗(如牛眼窗)、罗马万神庙穹窿顶上的圆孔,以及爱奥尼亚式柱头上涡卷形中心的圆凹等。
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