Water fall falling out of / into bounds.
Made two copies of the original image.
then on the 1st copy I created the two frames using the pen tool, and flood filled them with white. I selected the frames and inverted the selection and deleted everything outside the frames and flood filled that area with black.
On the second copy I spent a lot of time with soft, low opacity brushes and the eraser massaging the mask for the water between the frames. (5 years and 2364 days ago)