Yes, you are right, the motif of falling colourful balls was borrowed from a famous TV commercial, but the balls used were real. We didn't have that many of them, so we used computer animation and visual effects (VFX).
Pavel Sadílek, as a director and scriptwriter, put a story into the colourful ball, which tells where all those lost balloons come from? And don't they have a similar story? The next time you see a ball rolling around..remember.
