We are all acquainted with OPTICAL ILLUSIONS, illusions caused by the brain’s visual and perception systems playing tricks on us and characterized by visually perceived images that differ from objective reality.  Here are 2 well-known examples:

“My Wife and My Mother-in-law” published in 1915 by cartoonist W.E. Hill
(Do you see both an old and a young woman?)

This “widget” is an impossible object!! Can you see why?

These and other optical illusions work because of the structures and processes of our brains. Similarly, there are also “AUDIO ILLUSIONS” that work because of the brain’s auditory processing structures and processes.  Here are 3 AUDIO ILLUSIONS.  Because they are AUDIO ILLUSIONS, you have to be able to hear them to appreciate them!  Also, for the 2nd AUDIO ILLUSION, the McGurk effect, you have to be able to SEE the screen as well as HEAR the audio.