Other people's signs

You take your own signs for granted and they become invisible. Other people's signs are glaring sirens in the landscape and tell their own stories

There's one in Diapositive that came from a school in Buffalo; a place where shopkeepers sit in cages; Old Glory can be counted 13 times from the window of a diner.

This one warns of a natural danger; one that would have slipped my mind entirely had this not been posted. There's reason why 'Slytherin' is such a creepy name.