Do not be alarmed by the very large very sad clown prowling City Hall Park. It’s art! Entitled dog days are over, the performance piece by Swiss-American Ugo Rondinone is part of an outdoor sculpture exhibition called Lightness of Being; and will feature the guy above sitting around, staring at his lap and contemplating existence every day from 11AM to 5PM, as long as the weather’s good. In his artist’s statement, Rondinone describes the “big-bellied clown with a larger-than-life presence” as a “stand-in for a modern day shaman,” so there’s that.