The digital rendering produced in advance of the Eliasson waterfall project in New York City has here been printed out and taped over a moving waterfall picture (the kind of light picture you see in Chinese restaurants and such) with the waterfall section of the print cut out so that the moving waterfall image shows through. A camera is trained on the print and so produces TV footage of the waterfall on the monitor above.
The moving waterfall picture also makes wonderful running waterfall and bird call sounds to add romance to the rendering.