Note 49 — Chapter XIII · “DESIGN” IN ILLUMINATION “Design” — Elementary Patterns in Decoration — Scale & Scope of Decoration — Of “Designing” Manuscripts, Generally.
Reading edition
If the triangles were countercharged in colour and colour—e.g. red and blue—the zigzag would be made white, black, or gold, to separate and harmonise the colours (see pp. 182–83).