Protest Art Latest: Luke Ching goes underground on the MTR subway network in Hong Kong as a station cleaner to expose the low-paid work of a silent military

Luke Ching Chin-wai doesn’t quite match up as an undercover station cleaner on Hong Kong’s MTR subway network. He could easily be disguised behind a face mask, but one of Hong Kong’s most famous artists is just too visible. At 1.88 m (6 ft 2 in) tall and strong build, he dwarfs his only other peer, the stand-in foreman – a younger, older woman who is representative of the silent, invisible army that cleans surfaces. And cleans the toilet inside the city…