This installation in Astor Place has been up for a while, but it has taken me about three visits to be able to get photographs that actually do it justice. Entitled Flaming Cactus it is comprised of thousands upon thousands of interconnected zip ties (like these) wrapped around various light poles in a small one block radius. It was created by the Animus Art Collective as part of the Summer Streets Festival and will be up until June 2012.
See more photos and get more information here.
(Photos taken on my iPhone; see more on my Instagram account here)