PH 2/1 Pendant from Louis Poulsen, Former Poul Henningsen. The PH 2/1 Pendant is designed based on the principle of a reflective multi-screen system based on a logarithmic spiral with the centre of the light source in the centre of the coil. The three-ply blistered opal glass is shiny on the outside and sandblasted on the inside, which gives a soft diffused light.