A cataclysmic storm is unfolding. Dense, thunderous lines of black chalk sweep rapidly around the paper in frantic curls of awesome energy. Rocks tumble beneath the irresistible force of an engulfing flood. Cloud and rain, vapour and water, both churned by the same punishing vortexes, become almost indistinguishable. The scale is hard to judge until you glimpse, in the foreground, a hilltop fortress, dwarfed and ruined by the relentless inundation.