Mirrors in Mesoamerican culture
The use of mirrors in Mesoamerican culture was associated with the idea that they served as portals to a realm that could be seen but not interacted with. Mirrors in pre-Columbian Mesoamerica were fashioned from stone and served a number of uses, from the decorative to the divinatory.
Source: Wikipedia — Mirrors in Mesoamerican culture (CC BY-SA 4.0)