 Also other ontological topics relating to modal interpretations have recently become subjects of discussion. Thus, Calosi (2018) argues that BDMI and AMI pose significant challenges to quantum monism, that is, the view according to which there is only one fundamental entity —the universe as a whole. In the context of the discussion about the classification between \({\psi}\)-ontic and \({\psi}\)-epistemic models, Oldofredi and López (2020) show that such a classification is too narrow to include relational interpretations such as PMI.