Check out Norm Magnusson's I-75 project. The project involves installing historical markers with a political instead of historical message.

On the project, Magnusson writes:

unlike most artworks on social or political themes, these markers don’t merely speak to the small group of viewers that seek out such work in galleries and museums; instead, they gently insert themselves into the public realm.  ”Are they real?” is a question viewers frequently ask, meaning “are they state-sponsored?”  I love this confusion and hope to slip a message in while people are mulling it over.

These markers are just the kind of public art I really enjoy: gently assertive and non-confrontational, firmly thought-provoking and pretty to look at and just a little bit subversive.

Think Culture has a post on the project and check out more signs on I-75.

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