Olafur Eliasson — Waterfalls of New York

All four went live yesterday (above and below, Brooklyn Bridge).

Below,

the artist himself tells you what it's all about.

He elaborates here in a more in-depth video.

A slide show of the four waterfalls is here.

Finally, a detailed guide to viewing the waterfalls is here.

That oughta be enough to get you started, what?