The natural principles and analogy of the harmony of form
A treatise on geometric proportion by Edinburgh decorative painter and theorist David Ramsay Hay, published by Blackwood in 1842 for artists, architects and designers seeking rules of beauty by analogy with musical harmony. The plates are fine-line diagrams: concentric circles, inscribed triangles and squares, star polygons chorded across circles, and ellipses framed by rectangles and lozenges, all lettered and labelled for repurposing as linework patterns.
