before the descent of complete darkness (invisible birds)

törless was still gazing out into the garden. he thought he could hear the rustling of the withered leaves being blown into drifts by the wind. then came the moment of utter stillness which always occurs a little before the descent of complete darkness. the shape of things, which had been sinking ever more deeply into the dusk, and the blurring, dissolving colours of things--for an instant it