these structures are found in playgrounds.
1. do you know what I'm talking about?
2. what are they called?
ETA my original description:
moshimishi: do you guys know of the things in playgrounds called hamburgers
moshimishi: are they called something else
moshimishi: they're shaped like hamburgers
moshimishi: circular things
moshimishi: you crawl up a ladder to get into it
moshimishi: it's like a ufo