In her pink top and billowy skirt there is little outward sign that Diana, 24, spends her weekends executing inventive, eye-catching protest tactics on the frontlines of Hong Kong’s pro-democracy movement.

Millions of young people have taken to the streets all summer to fight for the city’s freedoms in the face of growing repression from China.

In increasingly chaotic clashes, the protesters at the frontline bring with them a variety of homespun tools to confound highly-trained riot police backed by extensive surveillance capabilities.

During the week Diana - not her real name - taps furiously on her phone chatting with fellow frontline activists about new ways to stay one step ahead of the authorities.