Barrels on Every Roof

From above, the rooftops of Manhattan carry a shape that repeats itself for block after block, a round wooden barrel standing on four thin legs, capped with a cone. Polly had counted dozens of them without knowing what they were before she landed close enough to watch one being built.

A raccoon carpenter worked alone on the roof, fitting long cedar staves edge to edge in a circle, no glue and no nails anywhere in the design. Steel hoops, tightened from the outside, are the only thing holding the whole tank together, the same method a barrel maker would have used, because a barrel maker on this street started the business back in eighteen sixty-six.

The city requires any building taller than six stories to keep one of these on its roof, because ordinary water pressure cannot reliably reach that high on its own. Gravity does the rest of the work once the tank is full, pushing water back down through the pipes whenever a tap opens anywhere below, and feeding the sprinklers first if there is ever a fire.

Somewhere between ten thousand and fifteen thousand of these tanks still stand across the whole city, most of them built by the same handful of family companies that have done the work for generations. Polly watched the last hoop go on and tighten with a single low note, then lifted off toward the next rooftop, and the one after that, all the way to the edge of sight.