Sound & colour : their relations, analogies & harmonies
A nineteenth-century London treatise by the physician John Denis Macdonald, published in 1869 by Longmans, Green, Reader, and Dyer, exploring parallels between musical sound and colour for a general educated readership. The pictures are plain line diagrams and small engravings: a set of concentric circles marked with letters, a staff of coloured notes keyed to the musical scale, four bark-like textures labelled a to d, and a colour wheel with a musical staff set in its centre, useful for designers working on synesthetic or chromatic scale layouts.
