Treehouse Village shitters!
It explains itself.
But in case you wanted some lore on the subject, this is a two-story treehouse with many buildings spanning multiple trees. There are two doorless, bucketless, flooded port-a-potties standing erect in the swamp below, but you couldn’t use them, obviously, since the waters are teeming with anglers, giant glowing radtoads and various waterborne diseases. Thus, the durable janitor-green sentinel we see here. I like that they reinforced the back of it with boards. That’s totally not just a result of the designer half clipping the shitter into the wooden barricade.