MEXICO CITY.- Although research conducted at Teotihuacan Archaeological Zone has allowed determining several of its urban features, the construction of its most emblematic monument, the Sun Pyramid, still presents enigmas, like the real significance it had for dwellers, since no historical sources exist. M.A. Ruben Cabrera Castro, researcher at the National Institute of Anthropology and History (INAH), tried to elucidate the sense this 65-meter building had for ancient Teotihuacan dwellers. Although information has been provided by material rests found, it is difficult to be certain about Prehispanic thought. At the conference series at the Center of Teotihuacan Studies, part of commemorations of the centennial of the opening of the archaeological site, Cabrera recalled that recently archaeologist Jaime Delgado conducted a survey among dwellers of the Valley of Teotihuacan and urban communities near Mexico City, workers and