This is a rare meteorological phenomenon called a skypunch. When people see these, they think it’s the end of the world. Ice crystals form above the high-altitude cirro-cumulo-stratus clouds, then fall downward, punching a hole in the cloud cover.
The Frontispiece from De Doodt vermaskert, which also contains genuine woodcuts from Holbein’s Great Dance of Death.
Ossuary of the St Catherine Monastery - Egypt
Ernst Fuchs, Beinerne Flamme (Burning Flame), 1972.