During this time period, there is also evidence of influence from the larger Teotihuacan in the Valley of Mexico. However, the exact nature of the relationship between the two cities is not entirely known. One stage of the Great Pyramid is done in talud-tablero architecture, similar to that of Teotihuacan, but the next stage uses a different style, with stairs leading to the top on all four sides. The stage after this one, built during the decline of Teotihuacan, again returns to talud-tablero. Pottery styles between the two cities are similar, especially in the early Classic period, but living spaces and some religious iconography was different. When Teotihuacan declined, Cholula also suffered a significant population decline. At this time, the area took part in the Epi-classic central Mexican culture, and the iconography changes to show Gulf coast influence. Religious focus was kept on the Great Pyramid, but added its own layers to the work.