Recently, the neighborhoods in Brooklyn have been the recipient of some new-fangled apparatus to lock one's bicycle. Very modern in look, one would confuse them at first for some new-age art.
I imagine that the city is thinking to the future, when the current meters, which are now used to lock bicycles, become extinct. Muni Meters are gradually replacing the old meters, which were perfect for attaching one's bike.
Trees are also "growing" in Brooklyn. The city is filling the sidewalks with young, sturdy saplings, hopefully to provide shade and fresh air to a city that has less and less greenery as time goes on.