A Guide to Line Art: History, Techniques, and How to Improve
https://www.skillshare.com/en/blog/why-line-art-drawing-may-be-your-next-favorite-creative-practice/
WEBArt History: The Origins of Line Art Drawing. Line art dates back nearly 75,000 years. In fact, the first known drawing made by a human was found on a rock flake in South Africa and is estimated to be 73,000 years old (3). The drawing on the rock, made by red ochre (a type of reddish-brown clay), consists of several criss-crossed lines.
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