The Augsburg Book of Miraculous Signs reveals a 16th Century society gripped by anxieties that we can relate to in the 21st Century, writes Rebecca Laurence. Giant locusts swarm around a jagged aquamarine mountain. Great whales and strange beasts flounder amid stormy seas. Inky skies rain hailstones and blood. These bizarre and terrifying visions are found in the Augsburg Book of Miraculous Signs,