Additionally, Figure 2 does not have any diagonal lines, unlike Figure 1.

图2与图1的另一个不同之处在于它没有任何对角线。

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So, the level curve corresponding to zero is actually two diagonal lines.

0的等高线实际上是两条对角线。

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Twill : One of the three basic textile weaves, distinguished by diagonal lines.

斜纹组织：纺织品的三种基本组织之一，特征是有斜条纹。

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Eggeling's "Symphonie Diagonale" from 1924 is a filigree of lines, while Richter's (except for a brief diagonal figure) maintains horizontality, more in keeping with the principles articulated by Piet Mondrian and (later) Josef Albers.

WSJ: Avant-Garde Film's Godfather | Hans Richter | Los Angeles County Museum of Art | Richard B. Woodward