I’m really puzzled by this sign.
My spontaneous interpretation is don’t run up this wall, but given that only superheroes such as Spiderman can do that, I guess it must be outlawing them instead.
I guess in theory the photographer might also have rotated the picture 90 degrees before uploading it, but then it just gets even more bizarre – something like don’t dance wildly?
Has anybody here got an idea what it might mean?