As many an art theory professor will tell you, painting is dead. Everything that one can do with paint on canvas or a wall, arguably, has been done. But maybe that's not so with the glorious art of sidewalk tagging. Freshly dumped and smoothed concrete has the power to release creative juices in the unlikeliest of passersby. See, you can't just approach the sidewalk with a sharpie with your teen buddies in the wee hours of the night and start going at it. No, with cement engravinig, if you will, being nimble and cunning is a must -- qualities most modern graffiti artists don't possess.

Here are some cement-tuned-notepads. SFist does not condone the timeless art of sidewalk scribbling, but we thought you might like to see what's happening below your feet.