The novel's first action, "Buck Mulligan came from the stairhead," situates the reader on the roof of a small military tower in Sandycove, seven miles from Dublin on the southeastern shores of Dublin Bay. Mulligan then stands at the stairhead and calls "down the dark winding stairs" of a steep stone passage that connects the tower's topside battle station to the living quarters one floor below. Finally, he moves to the raised stone platform that once held a swivel cannon but now serves as his makeshift altar: "he came forward and mounted the round gunrest."

John Hunt 2011

2002 photograph by Rebekah Frumkin showing the top of the Sandycove tower, including the "gunrest" at lower left and the "stairhead" on the right. Source:

Retouched diagram of the internal structure of a typical Martello tower, by ChrisO. Source: Wikimedia Commons.