The upper design on the sheet renders the top view of the domical vault
as a single continuous surface, with the courses of masonry depicted as simplified rings, while the lower design offers the correlated elevation of the domical vault
, but introduces the idea of the tripartite gored vault with its separating ribs; the squat windows on the cornice level are very lightly drawn on the paper, almost like pentimenti.
Supporting this interpretation is the observation, based on their varied uses of the Greek term kiborion, the root of the English word "ciborium" (applied later in this essay specifically to altars), that Early Christian theologians made no semantic distinction between, first, the domical vault
of a building, and second, the dome-like form sometimes employed for canopies over tombs (and altars).
Thus, creating a central yard at the middle of the building and constructing a water pond and garden in it increases the humidity in the biological environment, and also mud and brick walls, which are built with a relatively high thickness so that they can endure the heavy load of arched and domical vaults
, decrease the temperature variations during day and night as a heat capacitor.