In front of a building on Jean Street near Grand Avenue is an installation of stone-based artworks by Richard Botto. In my essay on Earth art over on my About.com site, I distinguish several varieties. This kind ranks low on the scale of sublimity or artistic rigor, but it is a lot of fun to look at and quite a commitment to beautification of the public space. And, of course, it gets people to see rocks.
Oakland Geology 
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