Hannah Smithson at Oxford has a beautiful research programme looking at medieval descriptions of rainbows and their relation to modern color spaces: here's an e

Hannah Smithson at Oxford has a beautiful research programme looking at medieval descriptions of rainbows and their relation to modern color spaces: here's an example that combines scholarly study of illuminated manuscripts and data from the Hubble Space Telescope. https://www.psy.ox.ac.uk/publications/464345 https://www.psy.ox.ac.uk/publications/464345 Interesting additional fact: 'rainbows' are not the same thing as the pure spectra that you might get from a prism.