"Fig. 31. Uxmal. House of the Nuns. West building. One of the serpent heads at the corner of the building that extend diagonally from the
middle section of the fascia.
Fig. 32. Uxmal. House of the Nuns. West building. Rhombic stones that
make up the center of the web of the frieze’s diagonal itzcouatl-lattice.
a. from the northern narrow wall,
b. from the eastern main front." 1917