"Wen" is the "Wen" of "writing", not the "grain" of "texture".

Text (name:, Roman word: jyoumon)

On the writing age in Japan;

The literary age in Japan began about 13000 BC and lasted about 10000 years.

At that time, the Aohe period had just ended and the earth turned into a warm period. People began to use adobe containers, roll them up with straw ropes and print patterns. Because there are no characters, this "rope pattern on adobe" gradually evolved into a "sign" or "symbol", which is called "rope pattern" in history. (as shown)

The Japanese in that era were also called "rope literati", and that era was collectively called "rope age".

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The above is the explanation of "rope writing" in Japan's "rope writing era".