|"Signs, signs, everywhere a sign..." on an otherwise peaceful evening yesterday
Out in the north lagoon authorities are emphatic about protecting the barene (mudflats) that are so important for tempering the force of tidal surges that threaten the city--though in this case the above signs specifically indicate submerged piles in the water on the borders of the barene. Boaters are not supposed to go ashore on the barene; they are also not supposed to blow past them at high speed, causing damaging wakes. In truth, the former restriction is heeded far more often than the latter.
For more on the importance of barene in the lagoon, and how they relate to Ruskin's ideal Venetian architecture, see: http://veneziablog.blogspot.it/2014/03/ruskins-irregularities.html.