Rubin's vase is a famous optical illusion created by Danish psychologist Edgar Rubin in 1915. It depicts a simple black-and-white image that can be interpreted in two ways: as a vase or as two faces in profile. This duality highlights how our perception can shift based on how we focus on the image. The illustration demonstrates the concept of figure-ground perception, where the brain distinguishes between the main object (the figure) and the background (the ground). This phenomenon is significant in psychology and art, as it reveals how context influences our interpretation of visual information.