In this photo by Ng Han Guan, performance artist Han Bing drags an iPhone and his friend Hui Li drags a string of apples in a shopping district where an Apple retail store is located in Beijing. Passersby stared at the performance, some snapping pictures, before security guards escorted the artist away. Han Bing says the walk is intended to highlight our obsession with the mobile phone and in particular Apple's product. The performance is a continuation of his past walks with a brick and a cabbage in various cities to raise questions about our attachments to things.