Poul Henningsen endeavoured to create glare-free light, direct light where it was most needed, and create soft shadows, using incandescent bulbs as a light source. Henningsen’s mathematic approach to lighting, using the logarithmic spiral, led to the development of the three-shade system in 1925-6 and the following product family, which over the years has included hundreds of different models, ranging from floor lamps to table lamps, pendants, chandeliers and wall lamps. The PH 2/1 Portable is a cordless version of the classic petite table lamp, which with its mouth-blown opal glass-shades and stem and base made of either high-lustre chrome or metallised brass. The portable version of the lamp is perfect for use both indoors and outdoors, particularly in spots where there may not be easy access to mains electricity, such as inside a bookcase or on a bedside table.