Plato’s dialogues stand at a transition from orality to literacy. They are living contradictions—partly oral and partly literary. This relationship between orality and writing is one of the most vexed issues in the history of Platonic interpretation and has particular relevance for the progressive erosion of literacy in favour of digitalisation today. This book argues that the relationship between the oral and the written in Plato’s dialogues is not a straightforward opposition, but is instead grounded in ontological analysis and exemplified by the ontology of the image, which appears throughout the Platonic canon.