[Scully]

You are speaking of causality :) Because of the rise in agriculture, societies had the time to develop complex rituals and traditions. But it was leisure itself that allowed these changes to occur. :)

[RadioAstronomer]

societies had the time to develop complex rituals

This may have been the predecessor to the development of religion.

[AndrewC]

Because of the rise in agriculture,

Might the explanation lie in the fact that the human became tied to the land. The survival of the groups depended on the success of the crops. The success of the crops depended on the group anticipating the environment, by learning through observation and notation. My observations about farmers is that they do not have much leisure time. Hunters relax, they just have to find the food on the hoof. Not many plays in the playbook. The best one involves driving stupid animals over conveniant cliffs(if available).