Looking back at Pollux from Castor WNW flank

Looking back at Pollux 4092m from half way up WNW flank of Castor 4223m on 11th September 2014. Beyond and to the left are the 3 summits of the Breithorn. In the right background is the mighty Weisshorn. The Rossi e Volante Bivouac (3787m), where we had just spent the night, is just below the top of a little rock step at the bottom of slopes descending from the nearer Breithorn summit (Roccia Nero) - right at the apex of an apparent wedge of sunlight.