Contributors to this issue discuss bidirectionality in metaphor from the perspective of various disciplines—semiotics, linguistics and psycholinguistics, cognitive psychology, computer science, and literary criticism. Its objectives are fivefold: to set out the intellectual history of the concept of bidirectionality; to demonstrate the interdisciplinarity of current scholarship and research in metaphor; to highlight different methods of research; to analyze bidirectionality with respect to visual metaphor, verbal metaphor, and adjacent phenomena such as simile, synesthesia, and analogy; and to chart out paths for future research based on the scholarship presented here.