And we're back with yet another week of New York's most colorful and most recent outdoor art offerings. Given the warm weather, it makes it that much easier to get your art fix outdoors rather than frequenting the rows of West Side galleries. From Public Art Fund projects and guerrilla-style graffiti to the second annual edition of Sing For Hope's pop-up pianos and a larger-than-life rainbow city beneath the High Line's phase two section, there's no shortage of sights to see on the city streets. Check out the latest works of art to pop up under the Tenth Avenue railroad, in City Hall Park, and everything in between. Have one to add? Share your photos with us on Facebook or Twitter!