This image came together from a variety of factors. The green color in the pool here is only visible when the water is low. It had not rained in quite some time and I knew it would be a good time to visit these falls. The water in this pool flows in a circular motion and as luck would have it there was a great deal of foam concentrated in the lower corner of the image. The image really would have been uninteresting without a long exposure to capture the foam as it moved in a circular motion. An overcast day made favorable shooting conditions and a circular polarizer helped to lengthen the exposure time.