You really don't need to go to a museum to see art in New York City. It is literally all around you in the streets and the parks. And it constantly changes. This great big yellow YO/OY sculpture in the Brooklyn Bridge Park is said to stay there through August 2016.
YO if you look at it from the East River Side and OY if you view it from the Brooklyn side.
It is right off the Manhattan Bridge in Main Street Park, Dumbo and provides some great views, a perfect pretty picture spot and some good laughs! Not only because the sculpture puts a smile on your face, but it is also fun to see all the people striking their poses in front of it. And yes....so did I. But I'm keeping those pictures to myself.