Daily Pic: A close-up on the five tons of porcelain sunflower seeds – about four million of them – hand made on the orders of Chinese artist Ai Weiwei, and now on show at Mary Boone Gallery in New York. They are a small part of the 150-ton sea of seeds that Ai installed in 2010 at Tate Modern in London, but they still have a wonderful effect. They inevitably stand for the sea of humans who live in China, and on earth – both for our  essential uniformity, and for the differences among us. You’re impressed by the quantity of seeds on view, until you realize how many more you’d need to  represent a full six billion people. The thought of all that chewing and spitting…