TROMPE L' OEIL - (pronounced - trump loy) is a french phrase which means "to fool the eye". This is a technique used by artists to trick the viewer into believing that they are seeing something three-dimensional before them.
What truly fools the viewer is the artist's use of shadows which, if done correctly, will have you taking a second glance to see if the object is real or just a painted illusion.

Napa Wine Cellar