He was running into more brick walls than an overworked mason.
The exterior brick walls are divided by shallow arches and pilasters, as in other churches of Ravenna.
The place figured frequently as a frontier fortress in the wars of the Romans and the Parthians, its brick walls being unusually thick and its citadel very strong.
One painted tomb was found at Nekhen (Hieraconpolis), now in the Cairo Museum; the brick walls were color-washed and covered with irregular groups of men, animals and ships, painted with red, black and green.
For lager-beer cellars and fermenting rooms, for bacon-curing cellars, and for similar purposes, brick walls with single or double air spaces are used, and sometimes a space filled with silicate cotton or other insulating material.