Chasing the ball

In this dream I am in my old high school, before they tore it down and built a new one. I am in the oldest building which is building 7 (you'll be hearing a lot more about this in other dreams....). I am the only person there and it's dark. I am running and kicking something through the halls. It's seems like a ball but it's floaty like a balloon and seems to be made of alumium foil. I kick it to the corner stairs, the third set of stairs then kick it down the stairs. As the ball goes bouncing down the stairs, I run after it. I'm running down the stairs is if the were flat ramps, not steps. I round the second flight of stairs and the dream fades out and ends.