Montage in cinema means to mount images and sounds from different sources, that are interpreted together and whose oppositions drive the story further. In this paper we develop the montage concept further for co-creation in interactive, tactile, spatial cross-media. As case we use the design of the interactive, tangible, cross-media installation ORFI. ORFI is developed to facilitate collaboration and co-creation between children with severe disabilities and their care persons. In this paper we focus on how we have designed for interactive montage. We present two main types of interactive montage, close and shifted in three dimensions (spatial, temporal and actorial). With the first we mean spatial and temporal closeness, depending on the roles users take and the interpretations they make during interaction. With shifted we mean how to use spatial and temporal shifting and distance between the media elements in space and over time, depending on the users’ roles and interpretations. All this to encourage co- creation over time, between a variety of users in different situations.