What Does It Mean?

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From our dictionary:
trompe l'oeil

(Fr. trônp lœ'yu; Eng. trômp' lā', loi')
1. visual deception, esp. in paintings, in which objects are rendered in extremely fine detail emphasizing the illusion of tactile and spatial qualities.
2. a painting, mural, or panel of wallpaper designed to create such an effect.