Hong Kong's classic photo opportunity involves a trip out to Kowloon where you can capture your travelling companions against the panorama of Hong Kong Island. Sadly, the view is often obscured by the severe hazes the city experiences, thanks to trapped pollution, much of which wafts in from the factories and power stations of neighbouring Guangdong province. The solution? Tourists have started to pose in front of a fake backdrop – complete with dazzling blue sky.