What does the pavilion symbolize and why ?

The pavilion was a hide-out, a place to get away. It allowed the students to feel like they were somewhere else.... away from their lives and spend some time with their friends privately, away from prying eyes and guardians. 

We loved our sports pavilion, maybe because it reminded us of those sweet little cottages people always had in picture books when we were young. I can remember us back in the Juniors, pleading with guardians to hold the next lesson in the pavilion instead of the usual room. Then by the time we were in Senior 2—when we were twelve, going on thirteen—the pavilion had become the place to hide out with your best friends when you wanted to get away from the rest of Hailsham.