Bookcases that attach to the wall were commonly found in interiors during the first half of the 20th century. Jean Prouvé also designed a number of different wall-mounted shelving units – such as the Rayonnage Mural produced by Vitra, which was originally conceived in 1936 for the École Nationale Professionelle in the French city of Metz. The two vertical wall brackets of Rayonnage Mural are made of painted bent sheet metal. With their streamlined shape, reminiscent of the rudder of an aircraft or ship, they are a recurring element in Prouvé‘s designs. The wall brackets have precise horizontal slits into which the solid wood shelves are inserted. Together the two contrasting materials form a practical shelf that has the sculptural qualities of an aesthetic object.