The Muglins lie about half a mile northeast of Dalkey Island, Co. Dublin, and are a danger to shipping. Many ships came to grief on these rocks until a light was established at around the turn of the 20th century. This image was made on a very fine night, and shows the northeastern extent of Dalkey Island, with the Muglins light beyond. On the horizon, the Kish lighthouse winks at us. This is a simple image, but there is plenty for the eye to wander over and appreciate—most notably the line of clouds near the horizon and the fine detail in the Moon's reflection. The sea is slightly smoothed as it was a long exposure, perhaps 15 seconds or so.
(You can buy a print of this photograph here: https://buff.ly/2JyjfNb)