Logician and philosopher of art Susanne K. Langer (b. 1895–d. 1985, née Knauth) has been a rather elusive protagonist in 20th-century philosophy. Mentioned alongside key thinkers such as Charles W. Morris or Abraham Kaplan in establishing the field of formal symbolic logic, she dedicated her early research to the study of symbols and contributed essential introductory literature. The young scholar—she was a student of Henry M. Sheffer and later completed her doctoral studies with Alfred N. Whitehead—continuously challenged analytic philosophy with audacious propositions and controversial semantic hypothesis. As philosophical hybrid, not only advancing elements from Whiteheadian process thought but sharing essential roots in Ernst Cassirer’s theory of symbolic form, the disputability in Langer’s theory, spans the continental divide. Langer introduced a “new key” to philosophy by emphasizing musical form in the making of meaning. Her 1942 book Philosophy in a New Key: A Study in the Symbolism of Reason, Rite and Art was a best-seller yet had little impact on major academic discourses. Herein she establishes the generative idea for a musical matrix from which symbolic articulation takes place in relational structure. Her aim was to address the problem of conceptualizing unlogicized areas of life, respectively myth, ritual, and arts. Growing emphasis placed on logical analysis rigidly divided the natural sciences and the humanities into “two cultures.” Whatever was excluded, following Langer, could nevertheless be reintroduced to the domain of genuinely intelligible symbols by expanding the spectrum of symbolic forms. Her semiology conceptualizes language, science, and logic hitherto as discursive form but adds artistic expression as presentational symbol to the semantic toolkit. She aimed to lever culture, religion, and artistic expression as equal mental resources for higher cognition. This emerges from her notion of logical symbolization as form, rather than determined by a concept of truth, which distinguishes her from her contemporaries in logical positivism. Langer’s core hypothesis suggests an art symbol analogue to feeling. Her theory, highly informed by process metaphysics, critiques and further supplements its ontology by advancing to scientific validation through empirical research. This culminates in a philosophy of mind enriched by anthropological, biological, and neuro-physiological studies in her magnum opus Mind: An Essay on Human Feeling I–II written between 1967–1982. Langer’s philosophy accounts for art’s epistemological import, hereby continuing a pluralistic approach with regard to the evaluation of its plentiful forms of expression.