Serpent mound and Christo's running fence both were similar to each other. Hummingbird on the Nazca plains and Smithson's spiral jetty also share similarities. Hummingbird is a great representation of a small animal. Serpent mount was made of agricultural commodities.
Spiral jetty is an earthwork sculpture built in 1970 and it's far taken into consideration as maximum sculpture via way of means of American sculptor Smithson. Running fence is a setup of the artwork piece via way of means of Christo and Jeanne claude.
Running fence made the viewer reflect upon the substance of our earth by examining the long expansion of the fence. Hummingbird and Spiral jetty was in how they used earth to create images.
Therefore the earthworks of the drawing are natural phenomena.
Learn more about the Earthworks of the drawing here:
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