"Ebbinghaus: Language is a system of conventional signs that can be voluntarily produced at any time."

“For professional musicians, musicologists, and serious students, knowledge of the psychology of music is extremely valuable but sometimes hard to come by. In this practical and authoritative study which pulls together information from musicology, physics, physiology, psychology, and aesthetics the distinguished Hungarian psychologist Geza Revesz offers a comprehensive view of the subject, including an overview of his own extensive, often revolutionary research in both music psychology and acoustics.”

“A theory of haptics is expounded which the author feels will establish "a foundation for the Haptics of form and the psychology of the blind." He differentiates between "Haptics of an essentially optical character" and "pure or autonomous Haptics" such as is experienced by those blind from early childhood. The weaknesses of certain psychological theories such as Gestalt, are discussed in terms of Révész's haptic theory. Part II of the book analyzes the aesthetics of haptic form and the art of the blind. The work of blind sculptors is presented and is analyzed.”