Easy on the eyes. Poul Henningsen sought to create glare-free lighting throughout his career as a designer, and for that we're grateful. This three-shade system was developed in 1925-1926 as entry in design expo in Paris, and it looks a lot simpler than it is. His aim was to direct light where it was most needed, to creating soft shadows while using incandescent bulbs as a light source (sucks to be American, we'll have to settle for LEDs, boo hiss). Henningsen was the first person to pursue a scientific approach to light and use the logarithmic spiral as a basis. By using a design based on the logarithmic spiral, he achieved even distribution of light over the entire curve of the shade. This even light distribution, together with the diffuse reflection through the glass, made it possible to control glare and shadow. He really was on a mission.  

The PH lamp model numbers refer to the shade size. Each top shade had a corresponding set of middle and lower shades. In the ‘pure’ models, such as the 2/2, the top shade has a size of approximately 20 cm, with corresponding lower shades. PH 2/1 Table consists of a top shade of approximately 20 cm, but here lower shades are used from the 1/1 model. The lamp provides soft lighting. PH 2/1 is designed on the principle of a reflecting multi-shade system, creating harmonious and glare-free lighting.