To mark the 30th anniversary of the Tiananmen Square crackdown in Beijing, the BBC took to the streets of China to ask random passersby if they recognized one of the most famous photographs of the 20th century.

80 percent of those asked say they’ve never seen the Tank Man image.

Tiananmen's tank man: Has China been successful in erasing memory of this iconic image? [Tap to expand] https://t.co/B3qLCH3Aj5 pic.twitter.com/ANLziKIfw2 — BBC News (World) (@BBCWorld) June 3, 2019

As is often the case in this kind of experiment, net users have questioned the methodology, arguing that those who do recognize Tank Man wouldn’t say so on camera to a foreign reporter after being randomly approached in public.