An architectural quirk on Merrion Street Upper in central Dublin. Developed during the second half of the 18th century, the road at this point suddenly narrows with the result that No.20 extends beyond its neighbours to the immediate north. Different coloured brickwork indicates the fourth storey is a later addition to the building when the roof height was raised, but the really distinctive feature is an elongated Wyatt window on the first floor. Note how the fenestration on the side components of the tripartite sash window differs from that in the central unit and how the whole is capped with a segmental arch incorporating a blind fanlight. Curiouser and curiouser, as Alice was wont to exclaim.
You can read more about Dublin in a piece I have written for the June issue of American Elle Decor.