Unless I'm mistaken, the Sony Smooth Reflections App takes multiple images of a scene and then forms a composite so that things that move (like people walking, or moving clouds partially obscuring a mountain top) will disappear, and things like ripples on water, or the water in a waterfall will take on a smooth ethereal appearance. I liken it to what would happen if you took a picture with a very dark ND filter using a long exposure. The nice thing is that no ND filter is required to achieve the effect, and focussing is much easier than with an ND filter. I find it a very useful app.