Assertion: obsidian's association | /r/HasProperty | strong
Facets:
Source sentences:
text: In Mexico, obsidian had a strong association with magic; the Aztecs used flat polished pieces of obsidian as tools for divination, much the same way glass mirrors-
text: The association of the human eye with mirrors was so strong that stylised eyes were frequently used in Teotihuacan art as a substitute for the face of a mirror.