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.
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.
As "Art".. well, I don't know. But everyone does get to take this picture.