Mental jaw drops open. The sound of the deluge almost overwhelms me more than the sight itself. My hands grasp the wire fence as I stare downward into the urban rapids, when only moments ago I had passed by the stagnant and silent waters of the canal. This is the diametric opposition to the composure of reflective pools where we might seek some sort of tranquility; yet this too provides a certain pleasure, one of fearful exhilaration.