The sun rises above the horizon, but is not yet above the clouds -- photographed from the plane leaving Beijing.
UPDATE from Simon: This photo is actually sunrise over Townsville (Australia) At the
moment the photo was taken the sun appeared to be trapped between the
horizon and a cloud layer and we were looking down on it (In fact, we
could well have been seeing the sun due to refraction, and it probably
hadn't even risen above the horizon)