Rubin's Vase is a famous optical illusion created by Danish psychologist Edgar Rubin in 1915. It depicts a vase that can also be seen as two faces in profile, depending on how the viewer interprets the image. This duality highlights the concept of figure-ground perception, where the brain distinguishes between the main object and the background. The illustration demonstrates how our perception can shift based on focus and context. When one sees the vase, the faces recede into the background, and vice versa. This phenomenon illustrates the complexity of visual perception and how our brains process images in different ways.