Visual impacts of your sign design can not be underestimated.

Signs set the tone and style of your library as much as the design affects your users.

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Signs, their readability , quality and consistency of design will always be a primary interest of mine and I urge you to make it yours as well.  People do make up an opinion of you at first glance and they will do the same when they walk into your library. 

The premier quality of an effective sign is readability. If a sign cannot be read sufficiently from a distance to allow time to read it, then the message it carries is silenced.

As a general rule the Greatest Impact Readable Distance is 10 feet for every 1 inch of letter height.

credit:  ecs-signs.com