This project explores auditory illusion and its application in musical composition. While there are many examples of optical illusions, auditory illusion evades notice. Additionally, music theory generally promulgates rules for composers from the perspective of mathematics but rarely provides any clue about auditory perception and its limitations. This project composes intriguing musical pieces with illusory auditory perceptions by disassembling and assembling sounds and melodies to observe the effects of using auditory illusion in composing music. Beyond the research and composing, it reflects on why humans experience auditory illusion and asks whether human auditory perception is as sensitive as we believe. Does it make sense that today’s technology requires increasingly high definition and quality of sound and image? This project also considers the relationship between art and technology. Does the imagination inspired by art accelerate the development of technology, or does the evolution of technology provide more diverse expressions for art?