The Shoton – or yoghurt – festival is underway at the Drepung and Sera monasteries in Lhasa, with thousands of Tibetans and tourists arriving to take part. The festival kicked off with the monks unfurling a giant 500 year old thangka displaying an image of the Buddha Shakyamuni. The Shoton festival originated in the 11th century, and is now a weeklong celebration of both secular and religious events.