In "Crowdsourcing Systems on the World-Wide Web," Communications of the ACM, April 2011, there is a picture of Aaron Koblin's The Sheep Market with selected details, as an example of crowdsourcing. The caption states the illustration is "a collection of 10,000 sheep made by workers on Amazon's Mechanical Turk. Workers were paid $0.02 (USD) to 'draw a sheep facing to the left.'"
It was interesting to read the article in light of the many websites fibre artists use that have elements of crowdsourcing, such as Ravelry, Etsy, blog platforms, Flickr, and search engines. It covers issues such as factors that influence whether users contribute and to what degree, ways systems can determine the value of contributed data and weight contributions, ways crowdsourcing can be applied to solve problems not just aggregate data, and management, version control, and editing of crowdsourced content.