Yann Martel said this quote

They never look very big on the table, the bodies. It's built to accommodate the largest frames, there's that. And they're naked. But it's something else. That parcel of the being called the soul-weighing twenty-one grams, according to the experiments of the American doctor Duncan MacDougall-takes up a surprising amount of space, like aloud voice. In its absence, the body seems to shrink