Editing Tiwanaku (section)

===Akapana East===
The Akapana East was built on the eastern side of early Tiwanaku. Later it was considered a boundary between the ceremonial center and the urban area. It was made of a thick, prepared floor of sand and clay, which supported a group of buildings. Yellow and red clay was used in different areas for what seems like aesthetic purposes. It was swept clean of all domestic refuse, signaling its great importance to the culture.<ref name="Isbell2004a">Isbell, W. H., 2004, ''Palaces and Politics in the Andean Middle Horizon.'' in S. T. Evans and J. Pillsbury, eds., pp. 191–246. [http://www.hup.harvard.edu/catalog/EVAPAL.html?show=contents ''Palaces of the Ancient New World''], Dumbarton Oaks Research Library and Collection Washington, D.C.</ref>