Sunday was the long-awaited opening day for "Levitated Mass," the $10-million environmental sculpture on the grounds of the Los Angeles County Museum of Art.

The centerpiece of Michael Heizer's artwork is a 340-ton boulder that captured the imagination of many as it made its way across four counties, from a quarry in Riverside to the Wilshire Boulevard museum.

Hordes of people jammed the site Sunday to see the rock in its new and permanent home. And they took a lot of photos.

Here, via Twitter and Storify, we've compiled a selection of photos that begs the question: Does a rock have a good side?

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Photo: Alisa Katz gazes at artist Michael Heizer's "Levitated Mass," which opened to the public at the Los Angeles County Museum of Art. Credit: Genaro Molina / Los Angeles Times