These bricked up windows (and additional artwork) can be found on the Jerwood Space, a rehersal/studio space in Union Street, Southwark. I'm in two minds whether the windows were bricked up for utility purposes, or to reduce their Window Tax. That was a tax current until the 1850's paid on the number of windows you had. Many Georgian properties have windows bricked up as a result, hence a possible source of the expression "It's daylight robbery". I suspect it was just to convert its use, though.