Iconicity and naturalness remain controversial concepts in recent linguistic research. The present volume aims to scrutinize unresolved issues of iconicity and naturalness in language. The studies discuss topics such as naturalism in the philosophy of language and the epistemology of linguistics, linguistic iconicity in semiotics, iconic structures in Sign Languages, natural and unnatural sound patterns, the iconic nature of parts of speech, the relation between (un)markedness and naturalness, and lexical and syntactic iconicity. The research conducted is based on sound (meta)theoretical analyses and/or original empirical research. The data and innovative views presented are bound to spark discussion in an age-old debate that has lost nothing of its significance.