Some writers lead us into lives we’d never otherwise imagine; Michael Herr, writing on the fear and madness of war, was one; Thomas Merton on monastic seclusion, another. Oliver Sacks was one as well. He was an explorer of mind and brain, where words like inconceivable, or magical, or sometimes alas tragic, are not overblown but just plain fact. Everyone’s heard of the man, his wife and the hat – but Sacks met many, many others whose lives were just as much sources of wonder. He was open to them because his own experience was extraordinary too. His writings and his life are almost equally absorbing.