@ludwigsdiana well, it is not very big. There were some children, probably from a sports club. If you look closely, there are 'ghosts' moving around there. But not many, true. Some more were on the right hand, outside the frame. These two were the closest.
@yaorenliu They were practicing football. Some sort of circuit training. The boy on the left was goalkeeper (with gloves) and was throwing the ball to the boy on the right who had to intercept it in a certain way.
