Borussia Dortmund fans - and German supporters in general - are renowned for their innovative and entertaining displays during big matches, particularly on Dortmund's South Terrace, which is informally known as the "Yellow Wall".
An incredible display was put on show before Dortmund's dramatic 3-2 Champions League quarter-final win against Malaga last week, for example.
But how do they actually create these amazing shows? The video above - which should play automatically - explains everything.
Singing and dancing is heavily coordinated with Germany's football authorities happy to let fansRead More »from How Borussia Dortmund’s fans created their breathtaking banner