The dominant historical account of constructional polychromy in Britain describes its emergence in the fifteenth century as a by-product of the introduction of brick-making under Flemish influence. Blue bricks, over-fired or possibly deliberately vitrified, were put to use creating patterns and colour contrasts in load-bearing walls. This constructional polychromy passed from fashion in the late Renaissance period before returning to popularity in the mid-nineteenth century, prompted, it is said, by John Ruskin’s The Seven Lamps of Architecture (1849) and The Stones of Venice (1851–53), and landmark buildings, notably William Butterfield’s All Saints, Margaret Street in London, designed in 1849.