The Thousand Hand Guanyin (Qian Shou Guan Yin): it would be impressive for any kind of dancers, but consider that all 21 performers of this are all deaf-mute deaf… Just imagining the sheer  amount of rehearshals involved boggles the mind.

(on other videos, you can see that they have white-dressed coordinators standing to the side, and they can of course refer to each other for the moves, but still… that remains one of the most impressive feats of coordinations I’ve seen. )

(from Mary Robinette Kowal)