How does the model impossible waterfall

How does the model impossible waterfall

It is known that according to the laws of physics the water can not flow upwards, but the famous Escher lithograph spodvigla this guy on the creation of such a spatial illusion. And he wants to convince us that everything is as it is - the water flows up!

Of course, this is nothing more than a trick, and that's one of the versions, reveals the secrets of this waterfall:

Not so important - pump, or just video editing create a full sense of the paradoxical movement of the water, it is important that such a stunt with water again not everyone can.