“The Venus Effect” is a fascinating concept in painting and film that shatters the illusion of the perceived, the perceiver and the preceptor. In the example below, the woman is peering into a mirror.
At first glance, we think she is looking at her own reflection, but the angle of the mirror deceives us, because she is really directly looking at us, not herself. In fact, the artifice of assumption is something of an aesthetic cheat because we fail to realize she is watching us while we watch her. She is incapable of viewing her own reflection in that particular angle of yaw.