Water...in its liquid form...and in motion...is such an interesting visual topic to me. Whether it's a singular rivulet of a stream snaking it's way amongst a large boulder field, or a large waterfall just roaring over a cliff face and 'skiing' down that face like skiers traversing a moguls course.
What fascinates me most is it's utterly relentless pursuit to find the lowest spot it can. It will go over or around anything in its path and will carve out a new path occasionally as well. It's a 'Mad Dash' that never ends until that low spot is found. It's only then it will rest.