Spanish sculptor Jaume Plensa has a site specific work in Madison Square Park:
Echo depicts a nine-year old girl from Plensa’s Barcelona neighborhood, lost in a state of thoughts and dreams.
Plensa’s sculpture also refers to an episode in Greek mythology in which the loquacious nymph Echo is forced as punishment to repeat only the thoughts of others. Both monumental in size and inviting in subject, the peaceful visage of Echo creates a tranquil and introspective atmosphere amid the cacophony of central Manhattan.
You can also see a video of the making of the 44 ft sculpture (YouTube)
The Wrong Empire 