'After wading in unknown waters, I take sinking steps back through the sand. On a recent trip to Port Willunga, I feel South Australia’s undulating ocean for the first time. I return to dry concreted land and shake my foot. I dust it off with light slaps, watching grains of sand fall gently onto the cement. But more remains—persistent, stuck to my feet, unshakable in the crevices between my toes. The deep turquoise tide whooshes ahead of me, the breeze nudging more sand to detach and I wonder, how many grains of sand are there in the world?' (Introduction)