MuVi6 is the sixth edition of the publication dedicated to Visual Music – following MuVi (Granada, 2007), MuVi2 (Granada, 2009), MuVi3 (Almería, 2012), MuVi4 (Alcalá la Real, Jaén, 2015), MuVi5 (Granada and Alcalá la Real, Jaén, 2018) – an event integrated with the VII International Congress: “Synesthesia: Science and Art”, held from the 26th to 29th of October 2022, at the Faculty of Fine Arts of the University of Granada and at the Convento de Capuchinos in Alcalá la Real (Jaén), Spain. This event confirms its primary objective of providing perceivable, aesthetic (and synaesthetic) feedback on the theoretical contents addressed at the conference through lectures, debates and posters, proving over time, in the editions that have followed, to be capable of stimulating debate This particular edition, in line with the conference, aims to underline the challenge between the digital and the material: this is the interpretative key that we asked of both the authors of the preliminary essays anticipating the collection of works, and the authors of the video projects. Hybridisation was expressed on several levels, which can be summarised in two main trends: in the sources, where nature and the kinematics of the elements, e.g. liquids or gasses, are a source of inspiration; or in the hybridisation of techniques where the material and the digital alternate. Each edition surprises us with the richness of the productions, with increasingly complex compositional and technical solutions, undoubtedly facilitated by the evolution of audio/video software and visual programming languages that facilitate new aesthetic experiments. The sound/visual relationships are therefore as much the result of a perceptual analysis as of an algorithmic application that can escape the control of the perceivable