In this movie they took them up in space. They're floating around and doing zero gravity stuff. Well, they had to do it all on wires. All the wires had to be painted black against this black background. If you didn't light it properly you could see the wires. Drove them crazy!
It's a lot harder to do an ensemble because your energy is going in so many different places, and you have to cover everybody. You have to sort of split your attention.