The façade concealing a narthex that runs the full width of the structure is precisely as wide as its height from the entrance level to the apex of the pediment; it may be fitted with the perfect geometry of the square.
A structure's outer layer conceals a narthex that extends across its entire width, matching its height from the base to the highest point of the roof; this design can be perfectly integrated into a square shape, reflecting the building's overall proportions.