This is Levitated Mass - an art installation at LACMA (the Los Angeles County Museum of Art). It is interesting, but the story of how it got there is almost more interesting.
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The boulder was brought from the desert into mid-Wilshire district by huge hauler. It could only go, like 10 miles per hour, and had to use wide roads that could support the gigantic weight. There was a whole story that made national news about it (LINK). Suffice it to say, it was a grand kurfuffle.
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As "Art".. well, I don't know. But everyone does get to take this picture.