A cultural opening is a term used to describe the process of introducing a new culture or way of life to a population. The term AGRI is an acronym for Agricultural Revolution, which is the period of time in which humans began to transition from a hunter-gatherer lifestyle to one of farming and domestication of animals. This period of time marked a major shift in human history, as it allowed for the development of civilizations and the growth of cities. It also allowed for the spread of new ideas and cultures, which is what is meant by a cultural opening.