The meaning of a street artist’s work comes not only from its content, but also the laws, politics and religion, both official and unofficial, that govern the region. In Chiang Mai, in Thailand, street art is not necessarily illegal – the streets are filled with trash, good luck symbols and homemade signs – but many natives will tell you it is a form of expression that has no connection whatsoever with their country. They claim the few working artists are either westerners or Thais – mostly students – obsessed with western culture. But...