The restoration jigsaw puzzle

Time and the elements have been rough on some of the structures at Uxmal.  Not unusual to find buildings mostly intact, but with a wall or the roof fallen in.  Archeologists are painstakingly restoring the damage.  Here is a building that gives a great example of the situation and the restoration process.

First photo: pile of rubble stacked inside a partially fallen building.  These are probably the roof and wall stones found in and around the building, collected together for safekeeping.

Second photo:  the reconstruction process.  Believe some poor graduate student is doing a jigsaw puzzle with the rubble -- trying every piece, finding the one that fits correctly, chalking a label on it for correct placement in the rebuild.  These rocks are very heavy.