It's a tribute to Richard Wright, founding Pink Floyd member whose wheelhouse was mostly the keyboards - though he sang lead from time to time. The elegy was penned by David Gilmour's wife Polly Sampson.

The video, shot by Po Powell, is a surreal look the world below from a higher plane, possibly heaven. In it, an otherworldly shot of a man canoeing across the clouds (taken directly from the album's cover artwork) is juxtaposed with footage from the band in the studio and sweeping views of the remains of the Aral Sea, on the border between Kazakhstan and Uzbekistan.

"A surreal image if ever I saw one," Powell told Rolling Stone, "and a shocking example of human mismanagement and one of the planet's worst environmental disasters� The river has shrunk to 10 percent of its original size, destroying the fishing industry and whole townships."