Silent multitudes : Charles Bonnet syndrome -- The prisoners cinema : sensory deprivation -- A few nanograms of wine : hallucinatory smells -- Hearing things -- The illusions of Parkinsonism -- Altered states -- Patterns : visual migraine -- The sacred disease : epileptic auras -- Bisected : hallucinations in the half-field -- Delirious -- On the threshold of sleep -- Narcolepsy and night hags -- The haunted mind -- Doppelgangers : hallucinating oneself -- Phantoms, shadows, and sensory ghosts.