This intriguing Herb Rosenberg piece, whose not-so-intriguing title — A horse named NSA - Keeping an eye on you — sounds like a description of a bad political cartoon, is part of an exhibition in Highbridge Park called Oh Sit! 14 Sculptors Consider the Chair.
The exhibition consists of the work of — you guessed it — nine sculptors "respond[ing] imaginatively to the notion of sitting or using a chair." (As it turns out, 14 Sculptors is not a tally of participating artists, but the name of the group to which they belong.)
From the Parks Department's website, some more great artspeak: "Oh Sit! is framed as an imperative, a command—a way of asking the viewer to look and really consider the concept 'chair' both objectively and subjectively."