Trompe-l'œil is an art technique involving extremely realistic imagery in order to create the optical illusion that the depicted objects appear in three-dimensions, instead of actually being a two-dimensional painting.
The word trompe l’œil is French and means literally "trick the eye”.
This can be achieved by painting the shapes and especially the shadows of the objects very precise and detailed. The illumination has to correspond exactly with the natural lighting present.