Ubiquitous gaze, also referred to as pursuing eyes, is an art

Art

Art is the product or process of deliberately arranging items in a way that influences and affects one or more of the senses, emotions, and intellect....

 term for the effect created by certain portraits, such as the Mona Lisa

Mona Lisa

Mona Lisa is a portrait by the Italian artist Leonardo da Vinci. It is a painting in oil on a poplar panel, completed circa 1503–1519...

, which give the impression that the subject's eyes are following the viewer. When such a painting is viewed from any angle, the subject's eyes still appear to be looking straight into the viewer's. This is an effect of perspective

Perspective (graphical)

Perspective in the graphic arts, such as drawing, is an approximate representation, on a flat surface , of an image as it is seen by the eye...

 and may be deliberate or not.

Ubiquitous gaze is a common technique of the trompe-l'œil

Trompe l'oeil

Trompe-l'œil, which can also be spelled without the hyphen in English as trompe l'oeil, is an art technique involving extremely realistic imagery in order to create the optical illusion that the depicted objects appear in three dimensions.-History in painting:Although the phrase has its origin in...

school of painting, and can be seen in numerous works.