We can know everything in nature except that which knows nature. To the extent that man is a piece of nature, he disappears.
~ Allan Bloom, The Closing of the American Mind
I can hold my breath for almost four minutes. I lie on my back, very still. I close my eyes and imagine that I am a piece of turf or rock blind to the sky above me. After sixty seconds my lungs begin to heave, but the heaving stops after another minute. The feeling of my body in space drains away. The sense of touch and weight recedes. Grass – Stone – Nothing in particular. Two minutes later there comes a ghost, an apparition that I rediscover as myself.