










If I urinated and defecated into a pitcher of drinking water and then proceeded to quench my thirst from a pitcher, I would be undoubtedly considered crazy. If I invented an expensive technology to put my urine and feces into my drinking water, and then invented another expensive (and undependable) technology to make the same water fit to drink, I might be thought even crazier. [7]Given such legitimate concerns, we have to question not only how a particular technology and system is established but also how it becomes so "locked in" that further change and progress comes to seem impossible. Sewerage is, in fact, frequently cited as an example of a self-perpetuating system, largely because the initial investment is so large that alterations seem prohibitive and difficult, even if evolving circumstances makes change desirable. As urban planner Eran Ben-Joseph writes, "Historical decisions … have locked our current practice into a specific mode of operation." [8]




