The aim of this study is to analyse and contextualize in aesthetic theory medial phenomena such as intra-, inter- and transmediality, in Jimmy Liao’s picturebook Starry Starry Night. In order to analyse intra-, inter- and transmediality, I use Jørgen Bruhn’s mediality model based on the term heteromediality. In contrast to the term intermediality, heteromediality highlights that blending is a priority condition in all media, and that the blending aspects matter. Therefore, the mediality model focuses both on relations between several media and on relations within a single medium or a single artefact. The theoretical framework in the study is mainly based on intermedial theories and picturebook theories. However, in the analysis and in the aesthetic-theoretical contextualization I also use perspectives and concepts from aesthetic theories such as the term aesthetic and the term radical aesthetic. According to my findings, the medial phenomena in Starry Starry Night can have several functions and effects. Firstly, the medial elements can clarify, contradict, complement and expand the narrative. Secondly, the medial relations can contribute to an intramedial thematization and to a direct and indirect characterization. Thirdly, the medial dialogue can influence the interpretation, produce different interpretations and lead the readers’ reception. Finally, the medial phenomena can explicitly and implicitly challenge, revolt against and deconstruct certain values, power relations and beliefs about the world.