Those are neat, but I don't approve of them being located where they are, right next to a sidewalk. What happens when a curious tottler walks up to one just as the parent looks down to see the sign? Toddler pushes on a lower rock, parent just starts to yell "No!" as a 35 pound rock falls down onto the top of the kid's noggin, causing brain damage for the rest of her life. Not good.
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