Dalle de verre
Dalle de verre, French for slab of glass, is a method that uses thick chunks of coloured glass, usually about 20 to 30 mm, chipped to give faceted edges and set in concrete or epoxy resin instead of lead came. The thick glass glows with intense, jewel-like colour.
The technique was developed in France in the 1930s and spread after the Second World War, when new churches needed large windows in modern materials. It has been used for walls, windows and screens in churches, public buildings and private houses, and combines well with contemporary architecture because the cement or resin is strong enough to support itself.
The glass is shaped by chipping with a hammer, called faceting, and the chipped surface scatters the light.