The PH 3½-2½ series adds a glass-shaded floor lamp that follows Poul Henningsen’s breakthrough triple-shade system unveiled nearly a century ago and based on a logarithmic spiral to assure glare-free illumination. The mouth-blown opal glass shades are glossy on top and sandblasted matte underneath to provide soft and uniform light distribution and the sleek metal base comes in black, brass or high-lustre chrome finishes.