An attempt to map the journey taken by all the ingredients of a taco sold at a local taco truck in San Francisco. You can view a larger, barely legible version of this fascinating chart here. The orange lines on the map are thickest for edible shipments, thinner/dotted for aluminum and propane. The bar graph at the lower left lists the ingredients and distance travelled; the bar thickness indicates the type of shipment—thickest for trucking, thinner for train travel and ocean voyages. The list of ingredients, from least- to most-travelled is: Salt, Cheese, Tomatoes, Californian Propane, Cilantro, Sour Cream, Onions, Beef, Corn Oil, Lime, Tortillas, Pinto Beans, Chicken, Avocados, Rice, Saudi Arabian Propane, Adobo Seasoning, and Aluminum. 
from “Tacoshed,” by students of the California College of the Arts, with David Fletcher and Rebar, 2009–2010 :: via BLDG Blog