Water

 “When you swim, you feel your body for what it mostly is – water – and it begins to move with the water around it. No wonder we feel such sympathy for beached whales; we are beached at birth ourselves. To swim is to experience how it was before you were born. Once in the water, you are immersed in an intensely private world as you were in the womb.”
― Roger Deakin, Waterlog