His team sprang into action and got censor-free footage that seems impossible. “The hardest footage to shoot was inside the I.C.U., Ai said, but he could not divulge how it was filmed. He said much of it was done with hand-held video cameras about the size of a smartphone that are able to stabilize images. It helped, he said, that many people were wearing masks: That made them feel less nervous about getting in trouble for speaking on camera.” – The New York Times