This criterion is vital. It explains how human norms and conventions differ in the ritualised behaviours present in nonhuman primates. This paper reconsiders glass beads that have hitherto been considered to be early medieval in day. While many groups of such beads are recognised from critical early Christian sites – https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf