Sometimes they are mounted on the wall as colored tiles. Sometimes folded like origami so that they can alter their luminous effect. They come in flat, long, round or square shapes. LEDs, light-emitting diodes, can be installed in almost any shape. They are durable, switch-proof and save 80 percent compared to the energy consumed by an incandescent lamp. They also enable an unprecedented variety of colors. More than 16 million shades can be mixed from the three primary colors red, green and blue – from pale pink to orange and ultramarine. Color sequences can be combined as desired, lighting scenarios programmed and rooms transformed within fractions of a second. Lighting designers are talking about a revolution: no other light source has made such a difference to artificial lighting since the invention of electric light.