Thomas Jefferson was originally planned to be on the right side of George Washington, but a crack in the granite forced them to sandblast the face off the right side and was added to the left. Also, as a sculptor myself, the plumb bob or pointal system used was remarkable! They basically had a sculpture 1/12th the scale sitting on top of the mountain and 1" = 12". They used this pointal system to sculpt from the model above. This system is still in use today, but they way Borglum implemented it was nothing short of artist genius! Thanks for posting this!