I found these pebbles submerged in salt water from the receding tide and after playing around with a couple of compositions settled on something where the pebbles in the pool were only a part of the frame. The stillness of that water deceives the eye hiding the water until you get up very close.
Pebbles in a Pool
Pebbles in a Pool - Phase One XF, IQ3 100, 120mm, f/14, 1/3s, ISO 50. 18 frame stack.