Atetelco is one of the best-preserved residential compounds at Teotihuacan, and what distinguishes it is not a single space but the relationship between all of them. The White Courtyard and the Red Courtyard are not two independent spaces joined by proximity: they are two moments within the same system, each with its own function within a logic that archaeologists are still reconstructing. The first appears to have served a military elite; the second, an instrument of timekeeping tied to the Venus cycle. That both coexisted within the same complex indicates that Atetelco concentrated functions that in other urban contexts tend to be kept separate: the formation of a warrior elite and the management of the ritual calendar, within the same walled enclosure. The rooms recently discovered beneath the floors add a third layer—more private spaces, with murals depicting everyday scenes and funerary objects, suggesting that behind the complex's institutional functions there was also a domestic life with its own rhythms and practices. Atetelco was not one thing; systematic excavation gradually reveals its complexity.