This is not collage, panorama, i.e. all the characters are in those places where they were when the photo was taken. But shots were filmed 23, selected and used 16, although 4 would be enough. Well, just empty it was warm at the rink on the evening of 8 March. Willing to be trained in observation can try to answer the question, how many characters actually skating, and how many times each one is repeated. I think that not marking characters on the original image in Paint, for example, to make it fail. I don't know the answer, I have not even seen skating around, when filming, as I was below the level of the rink.