Typically a Chomskyan notion. Integral Theory, however, uses it to refer to structures or holistic patterns that are shared by a group, whether that group be a family, a tribe, a community, a nation, all humans, all species, or all beings. Thus, “deep” does not necessarily mean “universal”; it means “shared with others.” And research then determines how wide that group is—from a few people to genuine universals. Lastly, all deep structures have surface structures that are relevant and specific to the group.