"Magic eye" refers to an optical illusion in which 3D images appear when staring at two-dimensional patterns. There are various synonyms for this term, such as stereograms, autostereograms, and single-image random dot stereograms. Another alternative phrase is "hidden image," which refers to the image that appears when the viewer adjusts their focus on the picture. These images have also been referred to as "hidden pictures," "3D images," and "optical illusions." Whatever the term used, these illusions offer a fascinating glimpse into the power of our visual perception and can be a fun way to challenge our brain's ability to process visual information.