This criterion is important. It points out how human norms and conventions differ within the ritualised behaviours present in nonhuman primates. And lastly, it can be crucial to know that beadwork may (Even though needless to say constrained) be analyzed with no real beads present! Some illustrations are presented in https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf