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In page Neolithic signs in China:

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In Qiu's opinion, they instead more closely resemble the non-writing symbols which remained in use even into the early historical period.[16] Another problem which has been noted is that, since the oracle bone script was fairly pictorial in nature, if one were to go back to ancestors predating them by over three millennia, one should expect an increase in the pictorial nature of the symbols, but in fact, a comparison of the majority of the Banpo symbols shows the exact opposite to be true.[17]