Looking up at the clouds tried to have an idea of them, but the only Idea I had was of the clouds of the previous day: upside down mossbed. Which I hadn’t thought to call them then. All cirrus clouds in blue skies evoke plains, beaches, deserts… (Not necessarily upside down because you seem to see them from within an airplane.)
Had read Appolonaire the previous night, French with English facing. Description of the flares overheard, which I can’t recall the French word for. He had choice and beautiful words for them, which one could imagine over trenches.