In 'Principles of ornamental art' (1875), Hulme discusses elements of design: line, texture, symmetry, color and contrast, and the key roles these play in creating visual variety, a sense of rhythm, variation and balance. Hulme, F. E. (1875). 'Principles of ornamental art'. London: Cassell, Petter & Galpin. Accessed April 4, 2023, from https://archive.org/details/principlesoforna00hulm/