Doors of Perception

Broad C D , 1929 Mind and its Place in Nature (London: Kegan Paul).

Gregory R L , 1996 “What do qualia do?” Perception 25 377–379.

Gregory R L , 1997 “Knowledge in perception and illusion” Philosophical Transactions of the Royal Society of London, Series B 1121–1128.

Huxley A , 1954 The Doors of Perception (London: Chatto and Windus).

Huxley A , 1966 Heaven and Hell (London: Chatto and Windus).

(NB. The Doors of Perception and Heaven and Hell are available in one volume in the Harper and Collins Flamingo series of modern classics, 1994.)