Cement warning

Cement warning

Soon as I saw the “warning” in the cement, I immediately thought of Fight Club:

Tyler Durden: Did you know that if you mix equal parts of gasoline and frozen orange juice concentrate you can make napalm?
Narrator: No, I did not know that. Is that true?
Tyler Durden: That’s right. One could make all kinds of explosives using simple household items.

Spotted on the roof of the Art Institute on Chestnut St.