 Many of the retrocausal approaches to quantum theory considered in  §6  are best understood with some type of perspectival interventionist account of causality in mind. A notable exception is the transactional interpretation  (§5),  in which causality might be best understood in terms of processes underscored by conserved quantities. The possibilist extension of the transactional interpretation, defended by Kastner (2006, 2013), moreover eschews the block universe picture.