[3][4] The word emplekton was borrowed from Greek ἔμπλεκτον and originally meant "rubble" but came to apply to the construction technique as well.
This technique was called opus caementicium, and eventually led to modern ferroconcrete construction.
[7] The buildings of the Taj Mahal are constructed with walls of brick and rubble inner cores faced with either marble or sandstone locked together with iron dowels and clamps.
In the Puuc region, and as far south as at least Tikal, the Mayans developed core-and-veneer walls to the point where, by the classic period, they were filled with concrete.
[11][12][13] Traditional core-and-veneer walls suffered from moisture migration and thermal expansion and contraction.