Williams O'Brien's description is somewhat abstract.

But Zong Shen was inexplicably able to understand.

Positive and negative are like two sides of a piece of paper.

The front is covered with various lines and patterns.

Due to the limited thickness of the paper, even if there is no painting or drawing on the back, the upside-down lines can still be vaguely seen.

The lines on the back can be understood as the reflection of the lines on the front, or as a unique

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