
- Simple: food attracts mice. Mice destroy books. Crystal clear.
- Unexpected: at the entrance of a library you expect a big poster with a red forbidden symbol crossing a cup and a sandwich icon, or just a NO FOOD, NO DRINKS printout, but NOT an alert to avoid feeding mice.
- Concrete: the message is quite specific...no mistakes here
- Credible: well it's posted by the library guys, they know about this stuff, right? Besides they give us a very compelling reason why we should not bring food into the library instead of the usual Don't do it. Period.
- Emotional: unless you are a ruthless human being, thinking of ruined books hurts.
- Story: again there is a strong visual component here. We picture the mice, or the varmints, or the critters, destroying the books...that visualization is like a little movie playing in our head, easy to remember and engaging.
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(*) Made to Stick is a book by Chip and Dan Heath on "Why Some Ideas Survive and Others Die". I highly recommend it. Their blog is pretty cool too.
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