Small waterfalls and stone

I was testing my brand new 4x ND filter on these small waterfalls, when my eye was catched by a strange stone which was looking like flying few centimeters over the water, as an effect of a magician trick. I decided to change the image framing, so to have the stone in the middle and the water, on the contrary than usual, not as the main subject of the image. Something against the standard rules (aren’t the rules made in order to be broken?)