ROGERS, W.S. (ed.). A BOOK OF SPECTRES. London: Dow & Lester, n.d., [1908]. Original blue-green cloth stamped in black. 25 color plates (when gazed at steadily for a minute or longer, each plate produces a “spectral form” when the viewer looks at a blank page or the ceiling). 8vo. Ricky Jay, Exemplars, p. 190.