Proto-cuneiform's evolution: Uruk V featured 47 signs (39 numeric/83%, 8 ideographic/17%), but by Uruk IV just 150-300 years later it had shifted dramatically toward ideographic notation. A rapid transition from counting to symbolic language representation.
Proto-cuneiform evolved from numeric to ideographic system within 350 years

Key facts
- Uruk 5 (3500-3350 BC) featured 47 signs: 39 numeric (83%) and 8 ideographic (17%)
- Uruk 3 (3200-3000 BC) featured 838 signs: 63 numeric (13%) and 733 ideographic (87%)
- Transition from mostly numeric to ideographic notation occurred over 150-350 years
- Proto-cuneiform developed into full writing system representing Sumerian language within 1,000 years
Sources
Proto-Cuneiform: Earliest Form of Writing on Planet Earth - ThoughtCothoughtco.com
The earliest form of writing on our planet, called proto-cuneiform, was invented in Mesopotamia during the Late Uruk period, about 3200 BC.
Writing May Have Begun 40,000 Years Ago - SciTechDailyscitechdaily.com
... cuneiform tablet of the Uruk IV period (VAT 14774), approx. 3350-3200 years old. This so-called numero-ideographic tablet features number signs ...
Proto-cuneiform - Wikipediaen.wikipedia.org
The proto-cuneiform script was a system of proto-writing that emerged in Mesopotamia c. 3350–3200 BC (during the Uruk period), eventually developing into ...
The Origins of Writing - The Metropolitan Museum of Artmetmuseum.org
Today, about 6,000 proto-cuneiform tablets, with more than 38,000 lines of text, are now known from areas associated with the Uruk culture, ...
Proto-cuneiform tablet of Uruk V period [IMAGE] - EurekAlert!eurekalert.org
Proto-cuneiform tablet of Uruk V period (VAT 15085), approximately 3500 to 3350 years old. This so-called numero-ideographic tablet carries numerical signs ...
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