Dún Briste, Downpatrick Head, Co. MayoThe pool is what made this photograph. Not the sea stack, as remarkable as it is, but that rock pool carved into the platform at the base of the cliffs. About eight feet deep, filled and drained by every wave. I timed the exposure to catch the water spiralling back out, and after several attempts I got the vortex I was after. Getting down there was the real challenge. You can only access the platform at low tide, and that's not a suggestion. The whole