On the banks of California’s Feather River, way below the tallest dam in the United States, is a ballet of steel and stone. The dancers are huge earth-moving machines, their costumes bright yellow.
The movement is constant and mesmerising. The lorries trundle down to the water from the left, pause to accept their loads of rock, mud and debris, and then exit to the right.
For weeks now this performance has been constant, day and night, as construction workers repair the Oroville Dam, once an engineering marvel, now an embarrassment.