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.