The Venus effect is a phenomenon in the psychology of perception, named after various paintings of Venus gazing into a mirror, such as Diego Velázquez’s Rokeby Venus, Titian’s Venus with a mirror, and Veronese’s Venus with a mirror. Viewers of such paintings assume that Venus is admiring her own reflection in the mirror; however, since the viewer sees her face in the mirror, Venus is actually looking at the reflection of the painter.

(Source: Wikipedia)