If Cooper’s ideal Existentialist is right, that a life project invests an I with cohesive selfhood, it can be extrapolated that a shared life project invests a We with cohesive selfhood.
Pushing it further, a project that transcends the comprehension of I but offers it a participatory role, might intuitively convey belonging in a society, but do so without an explicitly defined project.
Every self is a society. It is selves and societies all the way down, sahib — and it is selves and societies all the way up. But are they cohesive, purposeful ones? Should they be?