Poul HENNINGSEN Pair of wall lights known as "PH Hat" - circa 1960 Brass structure and adjustable diffuser Louis Poulsen edition 21 × 29.5 cm Bibliography : T. Jørstian, P. E. Munk Nielsen, Light Years Ahead: The Story of the PH Lamp, Éditions Louis Poulsen, Copenhagen, 1994, similar copy reproduced p. 283 A pair of brass "PH Hat" wall lamps by Poul Henningsen by Louis Poulsen - circa 1960 8.26 × 11.61 in. Poul HENNINGSEN