I'm sure there is some statistical analysis that can be done to predict whether a leaf will fall from its petiole, 20 metres to the ground, to land and become part of the photographer's image or be swiftly carried along by the stream which is fast-flowing and narrow, wide and slow in places, to flow towards the sea.
Or indeed to be thrown on to a rock and deposited there as higher water recedes.
The green moss here vibrant from recent wet weather, the same precipitation that feeds the stream and helps to bring those dried leaves to the ground.
And it's a scenic sight, reds and greens saturating this small corner of the Irish countryside.