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The oddly shaped temples on top of the great platform are called yacatas. The Templo Mayor fits right in the line of yacatas. Well, since the Tarascans beat the Aztecs soundly in the only major direct battle they fought, I guess we can say that Tzintzuntzan was the more powerful city. So then it makes sense that their main religious structure was bigger than the Templo Mayor.
The sizes of things are important, and differences in scale can teach us important lessons. These may not be simple or obvious lessons, but it is always important to keep in mind how big things are.
Fisher, Christopher T.
2005 Demographic and Landscape Change in the Lake Pátzcuaro Basin, Mexico: Abandoning the Garden. American Anthropologist 107:87-95.
Marcus, Joyce
2003 Monumentality in Archaic States: Lessons Learned from Large-Scale Excavations of the Past. In Theory and Practice in Mediterranean Archaeology: Old World and New World Perspectives, edited by John K. Papadopoulos and Richard M. Leventhal, pp. 115-134. Cotsen Institute of Archaeology, UCLA, Los Angeles.
Pollard, Helen Perlstein
1993 Tariacuri's Legacy: The Prehispanic Tarascan State. University of Oklahoma Press, Norman.
Smith, Michael E.
2008 Aztec City-State Capitals. University Press of Florida, Gainesville.