Figure 2. The spaghetti diagram indicates the flows of metals among a sample of metals processors
in New England. The arrows indicate the direction of the flow, while the number of lines indicate the
magnitude. Note the presence of waste reclaimers, dismantlers, and scrap dealers that allow for
system closure. Source: Frosch, R.A., Clark, W.C., Crawford, J., Tschang, T.T., and Weber, A., 1996,
The Industrial Ecology of Metals: A reconnaissance, From a talk delivered at the Royal
Society/Royal Academy of Engineering meeting, May 29-30, London, U.K.