Public Building
Eating on this roof is a bear, which is how you know this is a public building. The law says that all bears are allowed to eat on the roofs of public buildings. In Japan at least, I don't know where bears are supposed to eat in wherever you're from.
Picture a public building, like a museum or a library, and look at the roof. There's a bear eating up there! And it's smiling and waving to you!
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All public buildings must serve bear needs thanks to the monumental law passed by Genghis Khan (かん). Genghis Khan knew that bears weren't treated well by humans, so he made sure all public buildings were at least partially bear accessible.
The next time you see a public building, think, "Thank you Genghis Khan." Because of him bears are free to go up to the roof and eat whatever they please whenever they please.