Icebergs ... on Preston Street

A few days ago, I wrote of a meteorite - made of Luigi-ite - being found on Preston.
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Now, icebergs !
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Icebergs float, but just barely. Most of their bulk is unseen underwater.
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Who knew that fire hydrants had a similar tale? Shown here is a nice four-pack of hydrants, waiting for installation along Preston Street. Below the bright yellow tops, is a red pipe and way way down, is a valve point, to which a pipe runs to the water main.
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I have made a point of looking for fire hydrants in a number of foreign lands. I never saw any. They seem to be a north american piece of streetscape furniture.