La quatrième Trompette qui obscurcit le Soleil, la Lune, les Etoiles. Apoc. VIII 

This is "The Fourth Trumpet Obscures the Sun, Moon and Stars," by Facundus, made around 1050 with tempera on parchment. The illuminations of the Beatus manuscripts are a real treasure of medieval art. The artist has rendered the scene in a highly stylized way, with flat blocks of color and simplified forms. This was not due to any lack of skill, but rather a conscious aesthetic choice. He has controlled the medium to render a schematic composition. The parchment itself is made from animal skin, carefully prepared to create a smooth surface. This material would have been expensive and time-consuming to produce, reflecting the importance of the text it carried. Pigments were painstakingly made by grinding minerals, plants, and other organic materials to create color. The work involved in the production process is immense, requiring a whole suite of skills and a coordinated workshop. The image is a testament to the skilled labor and rich materials that went into its creation, blurring the line between art and craft.