Coggeshall's stone work is so very realistic. He keeps the color tones the same as if each block came from the same quarry vein.
He is careful, though, to keep each surface different in appearance.
An excellent example of one of Coggeshall's signature techniques is to the left: He makes this part of the wall look as if it is aged and damaged by creating the appearance of an old pealing skim coat surface of plaster. He calls this technique "broken parchment".

Originally, the stone mason had covered part of the block wall with a plaster finish, Coggeshall wants us to believe.

He plans the plaster breaks and stone stress cracks for areas that would likely be susceptible to damage and wear and tear.