Librarians are so helpful — they can answer any type of question and can help you find the book you’re looking for. But since libraries are places to read quietly, signs are an important method of communication to library patrons.

In libraries you can find different of types of signs.

There are cautionary signs:

Explanatory (and slightly unsettling) signs:

Passive aggressive signs:

And silly signs:

Tweet your favorite library sign to @melvillehouse.