The ritual activities of being in communion – recognition of one another’s baptisms, periodic actualization by the commemoration of one another’s hierarchs, joint eucharistic celebrations, and the occasional or regular intercommunion of members – etch the surface of the church, leaving visible channels expressing the unity of Christians who hold different eucharistic theologies and practices. Ritual expressions of communion with other Christians in Roman Catholic eucharistic practice are still relatively limited, and reflection on these practices is also still nascent. In this chapter, I suggest a new principle for ecumenical practice, followed by some ways that visible communion could be expressed honestly within eucharistic practice even before any positive change in Roman Catholic views on ecclesiality. In fact, I expect that it is through these practices (“the testing of new values in the crucible of the life and work of the receiving community”1) that the Roman Catholic Church will be able to discern the answers to the standing question of what it means to be “in full communion with Rome.”