LOS ANGELES (AP) — Turns out King Sisyphus had little on the folks at the Los Angeles County Museum of Art.In Greek mythology, Sisyphus was the guy who spent eternity pushing a giant rock up a hill.In modern-day reality, LA's largest museum has spent months — and millions of dollars — trying to get a 340-ton boulder from a quarry in Riverside to Los Angeles.Because of its size and weight, it will be a slow, complicated journey that could take 10 days or more.When it arrives at the museum, the rock will become the centerpiece of "Levitated Mass," earth artist Michael Heizer's latest creation.The two-story chunk of granite will appear to hover over people as they walk underneath it.