As documentary filmmaker Kiwi Chow walked through a pedestrian tunnel in Hong Kong on a recent day, he spotted a team of cleaners scraping off glue left by illegal ads and scrubbing the walls clean with mops.
It reminded him of the day he became an activist during the pro-democracy protests that galvanized this Chinese-ruled city in 2019. Back then, he had gathered with his young son and some friends to cover another tunnel wall with Post-it notes scribbled with political messages and drawings.
Strangers joined in.
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