Tina Jørstian and Poul Erik Munk Nielsen, eds., Light Years Ahead, The Story of the PH Lamp, Copenhagen, 1994, pp. 147-49 and p. 170 for a similar example; Charlotte and Peter Fiell, eds., Designing the 21st Century, Cologne, 2001, p. 321 for a later example; Charlotte and Peter Fiell, eds., 1000 Lights, Vol. 1: 1879 to 1959, Cologne, 2005, p. 317