Trompe L’oeil

https://commons.wikimedia.org/wiki/File:Tanlay_-_Chateau_52.jpg
Image: Wikimedia Commons

The grand gallery on the first floor of the Château de Tanlay, in Burgundy, appears to bear a vast program of sculptural decorations, but it’s all an illusion — the images were painted onto the walls and vaulted ceiling by Italian artists using the monochromatic technique known as grisaille.

The room, 26 meters long, was originally longer still, having been damaged in a fire in 1761.

More photos are here.

https://commons.wikimedia.org/wiki/File:Tanlay-Galerie_en_trompe-l%E2%80%99%C5%93il_(4).jpg
Image: Wikimedia Commons