North Korea’s famous mass games sees more than 30,000 children create incredible mosaic images — by holding up coloured books.

A huge 100,000 gymnasts, acrobats, and dancers take part in the show every year to honour the country’s ruler. The performances are known as Arirang, named after a popular folk song in Korea, and take place at the 150,000 capacity May Day stadium.

Photographer Werner Kranwetvogel. He was granted rare access to the communist country’s public displays.