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 3½-2½ Glass Table lamp was designed in 1928 and is one of many advanced projects undertaken by Henningsen in the development of his world-famous three-shade system. The louvre is 100% glare-free, with a design based on the principle of a reflective three-shade system, which directs most of the light downwards. For some variants, the top shade is made of deep drawn aluminum with white inner surface that ensures gentle, downward light distribution. The two bottom handblown opal glass shades ensure a large glare-free light surface, making optimum use of the light source to provide comfortable, functional lighting.