Poul Henningsen strove to create glare-free light, direct light where it was needed most and create subtle shadows, using incandescent bulbs as a light source. Henningsen's mathematical vision of lighting, which used the logarithmic spiral, resulted in the development of the three-shade system in 1925-1926 and the following family of products, which over the years has included hundreds of different models, ranging from floor lamps to table lamps, suspended models, chandeliers and sconces. The PH 2/1 Portable is a cordless version of the classic small table lamp, which features blown opal glass shades and whose stem and base are Made of high gloss chrome or metallic brass. The portable version of the lamp is perfect for use both indoors and outdoors, especially in places where there may not be easy access to mains power, such as inside a bookcase or on a bedside table.