The incredible displays feature over 100,000 people in the performing complex routines that include tens of thousands of gymnasts synchronizing movements in line with a background of card-turners who create an ever-changing backdrop.
The rapid changes of image sees one card exchanged for another in a swift and synchronized movement that takes hours of rehearsals and detailed choreography.
http://www.dailymail.co.uk/news/article-2066807/North-Koreas-mass-games-performed-100k-people-pictured-close-time.html