'glimmering & shivering'

Starlings in vast flights drove along like smoke, mist, or any thing misty without volition— now a circular area inclined in an Arc—now a Globe—now from complete Orb into an Elipse & Oblong—now a balloon with the car suspended, now a concaved Semicircle—& still it expands & condenses, some moments glimmering & shivering, dim & shadowy, now thickening, deepening, blackening! 
Samuel Taylor Coleridge, recorded in his notebook on a carriage ride to London, November 27, 1799.

Image: Janis Goodman: Murmuration.