This volume surveys the key histories, theories and practice of artists, musicians, filmmakers, designers, architects and technologists that have worked and continue to work with visual material in real time. Covering a wide historical period from Pythagoras's mathematics of music and colour in ancient Greece, to Castel's ocular harpsichord in the 18th century, to the visual music of the mid-20th century, to the liquid light shows of the 1960s and finally to the virtual reality and projection mapping of the present moment, Live Visuals is both an overarching history of real-time visuals and audio-visual art and a crucial source for understanding the various theories about audio-visual synchronization. With the inclusion of an overview of various forms of contemporary practice in Live Visuals culture - from VJing to immersive environments, architecture to design - Live Visuals also presents the key ideas of practitioners who work with the visual in a live context. This book will appeal to a wide range of scholars, students, artists, designers and enthusiasts. It will particularly interest VJs, DJs, electronic musicians, filmmakers, interaction designers and technologists.