Craigslist Flotsam By Catherine Harris

Cross mapping items for sale and the nearest points of waterlines in South Lake Union, Seattle, WA.

South Lake Union is a man shaped lake with filled in marsh land and extensive dredging mostly accomplished in the early 20th Century. I became interested in the idea of flotsam — those items that wash up on shore, as an index of human presence in South Lake Union.
I looked on craigslist and found all the items people were selling in a particular 24 hour period. I then filtered for items which included a google map. Then I took those items and found their geo coordinates and placed a marker in google earth. I also used those geo coordinates to generate a metaball geometry through gHowl and Grasshopper, which mapped centers of intensity, by creating a dome like structure reflecting the numbers of contiguous or nearby points.

I used a nearest point mapping module in Grasshopper to take a tracing of the two most near coastlines, the southern shore of South Lake Union and the nearest ocean front and from those two lines, generated a series of possible lines to form the shortest distances between the two shorelines. This mapping is only possible because of the early 20th Century removal of Denny Hill, which was leveled to create the current topography of South Lake Union. Thus the land can be seen as transiently in its current angle of repose.

The conjunction of these two forms, projected on a Google Earth mapping of South Lake Union, gives a reading of the marginalized material goods and their potential trajectories.

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